How Hockey ChangedRules

NHL Scoring Doubled in 1929-30 Under the New Forward-Pass Rules

In 1928-29 NHL teams scored 1.46 goals a game, the fewest ever. Under a new package of rules built around the forward pass they scored 2.96 in 1929-30, and on one November night five games produced 42 goals between them. In December the league’s governors (one from each team, usually its owner) brought in an offside rule to slow it down: no attacker could cross the blue line ahead of the puck. It took about a fifth of the league’s goals back, but games still had 1.9 times as many goals as in 1928-29. Eight of the ten teams scored less after the fix; the Boston Bruins scored as often as before.

Verdict: Data story

By Edgehalla ResearchPublished 12 min read

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On Nov. 19, 1929, in Pittsburgh, Johnny McKinnon, a Pirates defenceman, scored four goals against the Toronto Maple Leafs. The season before, he had scored one goal in 39 games. Hap Day, a Toronto defenceman, scored four the other way, and the Pirates won 10-5.

“No such score has ever been made in major league competition within the memory of hockey’s old-timers,” James J. Long wrote in the Pittsburgh Sun-Telegraph the next day. Many games in the league’s first seasons had seen more goals, so on the game itself the records are against Long. The night was another matter. Across the league, teams scored more goals than on any NHL night before.

The season before, 15 games had ended 0-0.

Use the toolWho is the NHL GOAT?Era-adjusted scoring since 1917, and why goalie talent compressed.

In 1928-29, NHL teams scored a goal and a half a game

In 1928-29 the average NHL team scored 1.46 goals a game, the lowest of any season before or since. George Hainsworth of the Canadiens had 22 shutouts in 44 games and allowed 0.92 goals a game. The Chicago Black Hawks scored 33 goals all season. They were shut out 20 times, and from Feb. 7 to Feb. 28, 1929, they went eight straight games without a goal.

Across the league, 15 games ended 0-0 and 36 ended 1-0, out of 220. Before the next season, the Daily Colonist in Victoria wondered whether fans would “turn against 10-to-9 games as they rebelled over scoreless ties and 1-to-0 defensive battles.”

A year later, with the same ten teams and the same 44-game schedule, teams averaged 2.96. No game ended 0-0. The league leader in shutouts had 6, and Chicago scored 117 goals. Scoring had doubled, the biggest change from one season to the next in NHL history. By December the league was alarmed enough to pull part of it back.

Scoring doubled in 1929-30, a jump no other season has matched

Regular season, 1917-18 to 2025-26

Show data
Goals per team game jumped from 1.46 in 1928-29 to 2.96 in 1929-30, the biggest one-season change in NHL history.
SeasonGoals per team game
1917-185.03 goals a team game
1918-194.13 goals a team game
1919-204.79 goals a team game
1920-214.23 goals a team game
1921-223.96 goals a team game
1922-233.26 goals a team game
1923-242.66 goals a team game
1924-252.50 goals a team game
1925-262.31 goals a team game
1926-272.00 goals a team game
1927-281.90 goals a team game
1928-291.46 goals a team game
1929-302.96 goals a team game
1930-312.40 goals a team game
1931-322.49 goals a team game
1932-332.28 goals a team game
1933-342.41 goals a team game
1934-352.52 goals a team game
1935-362.16 goals a team game
1936-372.46 goals a team game
1937-382.53 goals a team game
1938-392.53 goals a team game
1939-402.49 goals a team game
1940-412.68 goals a team game
1941-423.12 goals a team game
1942-433.61 goals a team game
1943-444.08 goals a team game
1944-453.68 goals a team game
1945-463.34 goals a team game
1946-473.16 goals a team game
1947-482.93 goals a team game
1948-492.72 goals a team game
1949-502.73 goals a team game
1950-512.71 goals a team game
1951-522.60 goals a team game
1952-532.40 goals a team game
1953-542.40 goals a team game
1954-552.52 goals a team game
1955-562.53 goals a team game
1956-572.69 goals a team game
1957-582.80 goals a team game
1958-592.90 goals a team game
1959-602.95 goals a team game
1960-613.00 goals a team game
1961-623.01 goals a team game
1962-632.97 goals a team game
1963-642.78 goals a team game
1964-652.88 goals a team game
1965-663.04 goals a team game
1966-672.98 goals a team game
1967-682.79 goals a team game
1968-692.98 goals a team game
1969-702.91 goals a team game
1970-713.12 goals a team game
1971-723.07 goals a team game
1972-733.28 goals a team game
1973-743.20 goals a team game
1974-753.43 goals a team game
1975-763.41 goals a team game
1976-773.32 goals a team game
1977-783.30 goals a team game
1978-793.50 goals a team game
1979-803.51 goals a team game
1980-813.84 goals a team game
1981-824.01 goals a team game
1982-833.87 goals a team game
1983-843.95 goals a team game
1984-853.89 goals a team game
1985-863.97 goals a team game
1986-873.67 goals a team game
1987-883.71 goals a team game
1988-893.74 goals a team game
1989-903.68 goals a team game
1990-913.46 goals a team game
1991-923.48 goals a team game
1992-933.63 goals a team game
1993-943.24 goals a team game
1994-952.99 goals a team game
1995-963.14 goals a team game
1996-972.92 goals a team game
1997-982.64 goals a team game
1998-992.63 goals a team game
1999-002.75 goals a team game
2000-012.76 goals a team game
2001-022.62 goals a team game
2002-032.65 goals a team game
2003-042.57 goals a team game
2004-05–
2005-063.03 goals a team game
2006-072.88 goals a team game
2007-082.72 goals a team game
2008-092.85 goals a team game
2009-102.77 goals a team game
2010-112.73 goals a team game
2011-122.66 goals a team game
2012-132.65 goals a team game
2013-142.67 goals a team game
2014-152.66 goals a team game
2015-162.67 goals a team game
2016-172.73 goals a team game
2017-182.93 goals a team game
2018-192.98 goals a team game
2019-202.98 goals a team game
2020-212.90 goals a team game
2021-223.11 goals a team game
2022-233.14 goals a team game
2023-243.08 goals a team game
2024-253.01 goals a team game
2025-263.08 goals a team game
  • 1929-30: Forward passing in all three zones
Team goals for divided by team games played. Shootout goals are not counted. The two Montreal Wanderers games of January 1918, recorded as defaults and never played, are left out. The 2004-05 season was cancelled.

That is a 103% rise in one season. The next-biggest rise was 16%, in 1941-42. Skip the season lost to the 2004-05 lockout and set 2005-06 beside 2003-04, and scoring rose only 18%. The biggest fall was 23%, and it came the year before, when scoring sank into 1928-29.

So 1929-30 started from an unusually low year, and that makes any jump look bigger. A fairer test sets it against the three seasons before. From 1926-27 to 1928-29, teams averaged about 1.8 goals a game. Against those years, 1929-30 was still up 66%.

The owners rewrote the rules to open up the attack

The jump began in the rulebook. “Hockey has been knocked topsy-turvey,” the Daily Colonist told its readers in October 1929. “The rules committee rather timidly suggested that forward passing be allowed in all zones. The owners agreed, although they did not think the committee went far enough; so they shot the works, not only permitting forward passing in all zones, but also abolishing all offsides.” (An offside call stops play when an attacker gets ahead of the puck where the rules forbid it.) The paper went a little too far there: a pass still could not cross a blue line.

The forward pass came in a package of rules, and it had opened up in steps. NHL.com’s account and the Scouting the Refs rule history agree on the order:

  • Before 1927-28: forward passing was limited to small parts of the ice (from 1918-19, a 40-foot area at centre ice, according to the Scouting the Refs history).
  • 1927-28: forward passes allowed in the defending and neutral zones.
  • 1928-29: a pass could go forward into the attacking zone if the receiver was still in the neutral zone when it was made, but not inside the attacking zone.
  • 1929-30, the passing rule: at its September meeting the league allowed forward passing inside all three zones. A pass still could not cross a blue line. Nothing stopped attackers from waiting inside the zone before the puck got there, and some forwards camped near the other team’s net.
  • 1929-30, the rest of the package: no more than three players, the goalie included, could stay in their own zone once the puck had gone up the ice. Goalies could no longer hold the puck; a goalie who did gave up a faceoff ten feet in front of his net. Kicking the puck was allowed, though a kicked puck could not count as a goal.

Continues below

  • December 1929: the governors met in Chicago on Monday, December 16 and voted that no attacker could enter the attacking zone ahead of the puck. The *Boston Globe* reported it would take effect that Saturday, December 21. NHL.com calls it “essentially the same offside rule we have now”.

The Colonist spelled out what the new rules allowed. A team could now “station a man down around the enemy’s cage” to take a pass. The three-player rule meant a team could no longer “get one goal and then throw up a five-man defence in front of the cage guardian.” Such tactics, the paper wrote, “were the most objectionable feature of last season’s campaign.”

Every team scored more

Goals per game by team, 1928-29 against 1929-30

Show data
All 10 teams scored more in 1929-30, from 1.4 times as much (Toronto Maple Leafs) to 3.5 times (Chicago Black Hawks).
1928-291929-30Change
Boston Bruins2.02 goals a game4.07 goals a game+2.04 goals a game
Montreal Canadiens1.61 goals a game3.23 goals a game+1.61 goals a game
Montreal Maroons1.52 goals a game3.21 goals a game+1.68 goals a game
Ottawa Senators1.23 goals a game3.14 goals a game+1.91 goals a game
New York Rangers1.64 goals a game3.09 goals a game+1.46 goals a game
Chicago Black Hawks0.75 goals a game2.66 goals a game+1.91 goals a game
Detroit Cougars1.64 goals a game2.66 goals a game+1.02 goals a game
Toronto Maple Leafs1.93 goals a game2.64 goals a game+0.70 goals a game
New York Americans1.21 goals a game2.57 goals a game+1.36 goals a game
Pittsburgh Pirates1.05 goals a game2.32 goals a game+1.27 goals a game
The same ten franchises played 44 games in both seasons. The Detroit Cougars are today’s Red Wings.

The Bruins went from 2.02 goals a game to 4.07. Their coach Art Ross had pushed for the forward pass into the attacking zone. Cooney Weiland, who had scored 11 goals the season before, led the league with 43 in 44 games. His teammate Dit Clapper had 41, and Howie Morenz of the Canadiens 40.

The whole league rose with them. A typical team scored 2.1 times as many goals as the season before. Among the 88 skaters who played at least 20 games in both seasons, goals per game went from 0.17 to 0.29, and 61 of them scored more often.

The Pirates scored six goals in one period and won 10-5

One night in November showed what the new rules could do. The highest-scoring night of the season was Nov. 19, 1929. In Pittsburgh, Toronto went ahead 2-0 early. Then McKinnon and the Pirates took over. They scored six goals in the second period, three of them McKinnon’s. “FOUR GOALS IN THREE MINUTES,” the Sun-Telegraph’s game story announced in capitals. It called McKinnon the man “whose play stood out on a night when every member of the Pirate squad achieved stardom.” The paper’s summary credited Frank Fredrickson, the Pirates’ manager, with five assists.

“Never in local hockey history has one club ‘stolen the show’ from an opponent as completely as did the Bucs after the Leafs jumped into their 2-0 lead in the first minute of play last night,” the paper wrote.

For a single game, the records are against Long. On Jan. 10, 1920, the Canadiens beat the Toronto St. Patricks 14-7, 21 goals in one game. Long may have had something else in mind, and he did not say which record he meant. The night as a whole was new. The five NHL games that evening produced 42 goals. The most on any earlier NHL night was 33, three nights before. The best night of all of 1928-29 had 27.

Two defencemen scored four goals each that night in Pittsburgh. In the league’s game records from 1917-18 to 1964-65, it is the only game in which that happened. McKinnon finished the season with 10 goals. His Pirates won five games all season, and this was one of them.

In New York the same evening, the Americans had not scored against Chicago with three minutes left. George Massecar scored with 2:24 to play, “to save the Americans from the undesirable distinction of being the first team shut out under hockey’s new code,” The New York Times wrote. No team had been shut out yet. The season’s first shutout came in its 22nd game, on Nov. 24, when Chicago beat Detroit 4-0.

By the end of 1929-30 there had been 35 hat tricks, against four the season before. In 1928-29 a team was held without a goal in more than one game in four (27.3 for every 100 games). In 1929-30 it was about one game in 17 (5.9).

“People who knew hockey well found to their surprise that they were watching an entirely new game,” The New Yorker’s hockey column said on Dec. 7. “It was harder to watch than the old kind of hockey. It was, of course, faster, but whether or not it was better fun was hard to say.” The column had noticed the 19th as well: “One evening not long ago, when five games were played on various parts of the circuit, a total of forty-two goals was scored.”

The players had views too. “It’s a better game for the spectators,” Frank Boucher of the Rangers said in Long’s column, “though in Canada public opinion is divided. Ottawa is strong for the new game, but Montreal and Toronto are still on the dasher.” (The dasher is the top of the boards; sitting on it meant they hadn’t made up their minds.) His teammate Leo Bourgault said the new rules “require many more miles of skating and give a defense man more to worry about. He has to watch the guy coming at him and the fellow in the corner.”

Five weeks into the season, the governors brought in an offside rule

Nights like that worried the men who ran the league. Its governors met in Chicago on Monday, Dec. 16. “The amendment forbids any player on the attacking side crossing his opponent’s blue line ahead of the puck,” the wire story in the Edmonton Bulletin reported the next day. The old rule, it said, had “permitted players to go down to the defending cage and wait for team mates to bring the puck down, similar to a ‘basket hanger’ in basketball.” A basket hanger is the player who loiters under the other team’s basket, waiting for a long pass. The passing rule itself stayed, “indicating the governors wished to tame the game down only a little.” The change, the story said, would “become effective Saturday.”

The Bulletin’s story said the change had been sponsored by Leo Dandurand, president of the Canadiens, and Conn Smythe of the Maple Leafs. The Christian Science Monitor named J. Cooper Smeaton, the referee, as “one of the chief advocates of the change.” Tom Shaughnessy, who managed the Black Hawks, had no objection to the rule, the Monitor reported, only to making it in the middle of the season.

Newsy Lalonde, who coached the Ottawa Senators, made a prediction. “I think you will find this change in the rules will lessen scoring and do more harm than good to the game,” he told the Monitor.

The last night under the old rules was Thursday, Dec. 19: three games, 24 goals. The first night under the new rule was Saturday, Dec. 21: four games, 18 goals. In Boston, the Bruins beat Chicago. “As expected there was an over-abundance of whistles during the Bruin-Hawks game which was the first played under the new rules,” Bill Grimes wrote in his Boston American column, Passing the Puck. Two nights prove nothing, but Grimes liked what he saw: the game had “far more appearance of hockey than it did when players were allowed to camp in front of their opponents’ nets.”

Only in 1929-30, the year of the fix, did scoring fall after December 21, and it fell by about a fifth

Goals a game, both teams together, before and after Dec. 21, NHL regular season, 1927-28 to 1931-32

In 1929-30 scoring fell from 6.91 to 5.49 goals a game after the offside fix of December 21. In the two seasons either side, scoring rose or held flat after the same date.

1927-28
3.6 goals a game
3.9 goals a game
1928-29
2.9 goals a game
2.9 goals a game
1929-30 (offside fix)
6.9 goals a game
5.5 goals a game
1930-31
4.1 goals a game
5.1 goals a game
1931-32
4.4 goals a game
5.2 goals a game
  • Before Dec 21
  • Dec 21 on
1929-30 is the only season here with a rule change on December 21. The other seasons are the same calendar split, as a check for early-season effects. Early-season samples are 55 to 69 games.

Lalonde was right about the scoring. The NHL’s game-by-game records date every goal, so the goals before the fix and after it can be counted separately. In the 66 games from opening night to Dec. 19, teams combined for 6.91 goals a game. In the 154 games from Dec. 21 on, they combined for 5.49, 21% fewer.

How sure are we? A drop of about 1.4 goals a game, over that many games, is far too big to be luck.

Other seasons suggest the fix took away even more than that. In four seasons with no rule change in December (1927-28, 1928-29, 1930-31 and 1931-32), games after Dec. 21 had about 0.6 more goals than games before it, on average. If 1929-30 had followed that habit, its games after Dec. 21 would have had more goals than its games before. Instead they had about 1.4 fewer. With only four seasons to compare, that stays a hint.

It did not undo the forward pass, though. After the fix, games still had 1.9 times as many goals as in 1928-29.

Boston scored as often after the fix as before it

The fix landed harder on some teams than others. Lalonde’s own team fell furthest. Ottawa scored about 4.2 goals a game before Dec. 21 and 2.7 after, the biggest drop of any team. But Ottawa’s slump started two weeks before the rule did. The Senators scored almost five goals a game in their first nine games, through Dec. 5. On Dec. 7 they played the Maroons in Montreal. From that night through Dec. 19, all under the old rules, they played four games, scored fewer than three goals a game and won none. Their next game was Dec. 21, the first night of the new rule, and they didn’t win that one either. That made five games without a win, two of them ties.

Grimes noticed in the Boston American on Dec. 23. Ottawa, he wrote, had “stepped on the toboggan the night of the Maroon game in Montreal and are still sliding. In five games, the best Ottawa has been able to do is a couple of ties.” The rule landed on a team that was already sliding, so it can’t take all the blame.

Eight of the ten teams scored less after the fix. Pittsburgh lost the largest share of its scoring, 39%. The New York Americans went the other way. They had scored only 26 goals in their first 13 games, and they scored 2.81 a game after.

Eight of the ten teams scored less after the offside fix; Boston held steady and the Americans scored more. NHL regular season 1929-30, from the NHL game-by-game records. Before = opening night to Dec. 19, 1929; after = Dec. 21 on. Record is wins-losses-ties. Sorted by the change in goals a game.
TeamGames beforeGoals a game beforeGames afterGoals a game afterRecord after
Ottawa Senators134.15312.7115-10-6
Chicago Black Hawks123.67322.2814-15-3
New York Rangers134.00312.7110-12-9

Continues below

Rows 4–10 of 10
TeamGames beforeGoals a game beforeGames afterGoals a game afterRecord after
Pittsburgh Pirates123.25321.973-27-2
Montreal Canadiens153.73292.9713-10-6
Detroit Cougars133.15312.459-17-5
Montreal Maroons143.64303.0015-11-4
Toronto Maple Leafs142.86302.5313-12-5
Boston Bruins134.08314.0727-3-1
New York Americans132.00312.8112-14-5

Boston barely noticed. The Bruins scored 4.08 goals a game before the fix and 4.07 after, and went 27-3-1 under the new rule. Weiland had 9 goals in the 13 games before it and 34 in the 31 after. Their 14-game winning streak ran from Dec. 3 to Jan. 9, 1930, straight through the change. At home they went 21-1.

They finished 38-5-1 with 179 goals. The Boston American printed their records on March 19, among them “Most goals scored in one season, 179. Previous record, 116, set by Les Canadiens in 1927-’28.” A win was worth two points then and a tie one, so the Bruins took 77 of the 88 points on offer. That is a points percentage of .875. Of the more than 1,700 seasons NHL teams have played, it is still the best. Next come the 1943-44 Canadiens at .830 and the 1976-77 Canadiens at .825. The 2022-23 Bruins, at .823, are fourth.

Each team played only 12 to 15 games before the fix. That is too few games to say why Boston held up and Ottawa fell.

Most of the new assists of 1929-30 came on new goals

The goals came with assists, and that raises a fair question about the scoring jump itself. Were teams really passing more, or were scorekeepers just handing out more credit? Start with the long view. In 1917-18 the average NHL goal came with fewer than half an assist (0.42). Today it comes with 1.69. The 1929-30 season moved it from 0.60 to 0.84, but most of the climb came later, in the 1930s.

Assists per goal jumped in 1929-30, then kept climbing through the 1930s

Regular season, 1917-18 to 2025-26

Show data
Assists per goal went from 0.42 in 1917-18 to 0.84 in 1929-30 and 1.55 by 1938-39. Since 1950-51 it has stayed between 1.44 and 1.74.
SeasonAssists per goal
1917-180.42 assists per goal
1918-190.50 assists per goal
1919-200.45 assists per goal
1920-210.44 assists per goal
1921-220.61 assists per goal
1922-230.67 assists per goal
1923-240.56 assists per goal
1924-250.63 assists per goal
1925-260.44 assists per goal
1926-270.48 assists per goal
1927-280.50 assists per goal
1928-290.60 assists per goal
1929-300.84 assists per goal
1930-310.93 assists per goal
1931-321.05 assists per goal
1932-331.21 assists per goal
1933-341.13 assists per goal
1934-351.31 assists per goal
1935-361.40 assists per goal
1936-371.27 assists per goal
1937-381.40 assists per goal
1938-391.55 assists per goal
1939-401.47 assists per goal
1940-411.50 assists per goal
1941-421.55 assists per goal
1942-431.52 assists per goal
1943-441.43 assists per goal
1944-451.20 assists per goal
1945-461.14 assists per goal
1946-471.30 assists per goal
1947-481.37 assists per goal
1948-491.36 assists per goal
1949-501.45 assists per goal
1950-511.44 assists per goal
1951-521.50 assists per goal
1952-531.50 assists per goal
1953-541.54 assists per goal
1954-551.56 assists per goal
1955-561.59 assists per goal
1956-571.61 assists per goal
1957-581.65 assists per goal
1958-591.63 assists per goal
1959-601.66 assists per goal
1960-611.65 assists per goal
1961-621.65 assists per goal
1962-631.62 assists per goal
1963-641.64 assists per goal
1964-651.62 assists per goal
1965-661.65 assists per goal
1966-671.64 assists per goal
1967-681.62 assists per goal
1968-691.64 assists per goal
1969-701.61 assists per goal
1970-711.63 assists per goal
1971-721.61 assists per goal
1972-731.64 assists per goal
1973-741.62 assists per goal
1974-751.62 assists per goal
1975-761.63 assists per goal
1976-771.62 assists per goal
1977-781.62 assists per goal
1978-791.63 assists per goal
1979-801.62 assists per goal
1980-811.62 assists per goal
1981-821.65 assists per goal
1982-831.64 assists per goal
1983-841.63 assists per goal
1984-851.66 assists per goal
1985-861.64 assists per goal
1986-871.64 assists per goal
1987-881.65 assists per goal
1988-891.66 assists per goal
1989-901.66 assists per goal
1990-911.67 assists per goal
1991-921.67 assists per goal
1992-931.67 assists per goal
1993-941.66 assists per goal
1994-951.66 assists per goal
1995-961.66 assists per goal
1996-971.65 assists per goal
1997-981.65 assists per goal
1998-991.68 assists per goal
1999-001.68 assists per goal
2000-011.70 assists per goal
2001-021.68 assists per goal
2002-031.70 assists per goal
2003-041.69 assists per goal
2004-05–
2005-061.72 assists per goal
2006-071.74 assists per goal
2007-081.72 assists per goal
2008-091.73 assists per goal
2009-101.72 assists per goal
2010-111.71 assists per goal
2011-121.71 assists per goal
2012-131.72 assists per goal
2013-141.71 assists per goal
2014-151.72 assists per goal
2015-161.67 assists per goal
2016-171.68 assists per goal
2017-181.69 assists per goal
2018-191.68 assists per goal
2019-201.67 assists per goal
2020-211.68 assists per goal
2021-221.69 assists per goal
2022-231.68 assists per goal
2023-241.68 assists per goal
2024-251.68 assists per goal
2025-261.69 assists per goal
  • 1929-30: Forward pass
Skater assists divided by skater goals, from the NHL’s current historical records. Early-season figures depend on how scorekeepers credited assists (see below).

Through the 1920s the line wanders between about 0.4 and 0.7. It steps up in 1929-30 and climbs hard through the 1930s. Since 1950-51 it has stayed between about 1.4 and 1.7.

If the scorekeepers had simply grown more generous in 1929-30, they would have started giving an assist on goals that used to go down as solo efforts. Solo goals would have become rarer. They didn’t. Goals with no assist went up, from about 0.6 to 0.8 a game for each team. Goals with an assist went from 0.82 to 2.18, 2.6 times as many. So most of the new goals came off a recorded pass, which fits a rule that made passing inside the zone legal. The records cannot show whether every credited pass was a real one.

Count it another way. In 1929-30 each team picked up about 1.6 more assists a game than in 1928-29. Suppose each new goal had carried assists at the 1928-29 rate, about 0.6 a goal. Then the extra goals alone would explain a little more than half of those extra assists (about 56%). About one in six of the extra assists (16%) were second assists, the credit for the player who made the pass before the last one.

One sign points the other way. Second assists started creeping up inside the season. Before Dec. 21, 6.1% of goals carried two assists. After it, 12.8% did, about double. The share of goals with any assist at all barely moved, from 72.1% to 74.4%. So goals that already had one name beside the scorer were picking up a second. The same rise shows up inside 1930-31 and 1931-32.

Through the 1930s, assists kept climbing while goals stayed flat

That creep matters for judging 1929-30, because it kept going after the season ended. Scoring settled. From 1930-31 to 1938-39, teams scored between about 2.2 and 2.5 goals a game, every season. Over the same years the average goal went from about one assist (0.93) to about one and a half (1.55).

About seven in ten of those new assists (69%) were second assists. The rest came from solo goals turning into assisted ones. Teams scored about 0.6 goals a game with no assist in 1930-31 and about 0.2 in 1938-39, while their total goals barely changed. That points to the scorekeepers more than the players.

Two-assist goals went from rare in the 1920s to most goals by the late 1930s

Share of goals with none, one or two recorded assists, 1917-18 to 1964-65

Show data
Goals with two assists were 3.6% of all goals in 1928-29, 10.5% in 1929-30 and 62.5% in 1938-39. From 1930-31 on, scoring stayed flat.
SeasonNo assistOne assistTwo assists
1917-1857.6%42.4%0.0%
1918-1949.3%50.7%0.0%
1919-2055.2%44.8%0.0%
1920-2156.2%43.8%0.0%
1921-2239.5%60.5%0.0%
1922-2335.1%62.6%2.2%
1923-2445.1%54.1%0.8%
1924-2539.3%58.4%2.2%
1925-2657.8%40.8%1.4%
1926-2753.2%45.2%1.6%
1927-2852.0%45.6%2.4%
1928-2943.6%52.8%3.6%
1929-3026.4%63.2%10.5%
1930-3126.7%54.0%19.4%
1931-3220.8%53.6%25.6%
1932-3317.8%43.2%39.0%
1933-3420.2%46.2%33.6%
1934-3514.7%45.3%40.0%
1935-3613.7%40.0%46.3%
1936-3716.2%40.7%43.1%
1937-3811.1%37.6%51.3%
1938-397.8%29.7%62.5%
1939-4010.7%31.7%57.5%
1940-4110.2%29.4%60.3%
1941-429.8%25.3%64.9%
1942-439.0%29.6%61.3%
1943-4411.6%33.8%54.6%
1944-4515.0%49.8%35.3%
1945-4617.4%51.0%31.5%
1946-4711.1%47.9%41.0%
1947-4811.4%40.2%48.4%
1948-4910.6%42.5%46.8%
1949-509.4%36.1%54.4%
1950-519.7%36.8%53.5%
1951-528.2%34.1%57.7%
1952-538.0%33.7%58.3%
1953-547.6%30.5%61.8%
1954-558.1%27.8%64.1%
1955-567.1%26.8%66.1%
1956-577.4%24.0%68.6%
1957-586.3%22.1%71.6%
1958-596.2%24.4%69.4%
1959-606.2%21.1%72.7%
1960-615.6%23.8%70.6%
1961-626.2%22.3%71.5%
1962-636.9%24.2%68.9%
1963-646.4%22.9%70.7%
1964-657.3%23.2%69.5%
  • 1929-30: Forward pass
From the NHL’s game-by-game records (the game feed), which list up to two assists per goal. Every season’s goal count there matches the official totals.

Watch the two-assist line. It hugs the bottom of the chart until 1929-30, then climbs past both other lines before the decade is out.

Scoring jumped in 1929-30 and then settled, while two-assist goals kept climbing. NHL regular season; goals a game are for each team.
SeasonGoals a gameAssists per goalGoals with no assistGoals with two assists
1927-281.900.5052.0%2.4%
1928-291.460.6043.6%3.6%
1929-302.960.8426.4%10.5%
1930-312.400.9326.7%19.4%
1934-352.521.3114.7%40.0%
1938-392.531.557.8%62.5%

In the last column, the two-assist share grows in every season listed, and goals a game hardly move after 1929-30.

The sources disagree on how those early assists were handed out. *Total Hockey*, the NHL’s official encyclopedia (as quoted by The Hockey Writers), says only one assist was recorded per goal before 1936, and up to three in 1936-37. The NHL’s own 2017 rebuild of its historical stats says a goal could carry three, and sometimes four, assists until 1935-36. That rebuild was entered by hand from original source material, and it corrected the assist totals of 370 players. The game-by-game records we used have two-assist goals as early as 1922-23 and hold at most two per goal, while the season totals show a few more assists than those records in 1934-35 and 1935-36. So the early assist numbers come from the NHL’s 2017 reconstruction, and they may differ from what fans read in the paper at the time. The exact rules on credit are still unsettled.

The season left the NHL its offside rule and a puzzle in its assist records

Set beside the league’s other seasons, 1929-30 leaves four things to keep in mind.

  • Few rule changes in NHL history have had a test this clean. Same ten teams, same schedule, mostly the same players, one package of rules built around the forward pass, and scoring doubled. The 103% rise has no rival in any other season.
  • The league brought in offside to slow the game down. It let passing in, saw goals pile up, and within three months stopped attackers from waiting in the zone. Scoring dropped, but stayed far above where it had been.
  • Compare early assist totals with care. Most of the 1929-30 jump came with real new goals off recorded passes, though second assists were already creeping up after December. The climb that followed, mostly second assists while goals stayed flat, is better read as a change in credit. A 1930s playmaker’s assist total and a modern one are not on the same scale.
  • Recent seasons have moved far less. Since the 2004-05 lockout, the biggest one-season change in scoring was 7.5%, in 2017-18. Changes like the fall in power plays (see The Power Play Is Disappearing) are on that smaller scale.

The assist records have limits of their own. They are the NHL’s 2017 reconstruction. The rules for crediting assists before 1936-37 are disputed. The NHL’s game-by-game records hold at most two assists per goal. The newspaper quotes come from scanned pages. We read each one against the page image and left out lines we could not read in full.

Boston’s first loss in Canada all season cost them the Stanley Cup

The day after the 10-5 game, Long guessed where it would all end up. He wrote that “a gradual decrease to such scores as 4 to 2 or 5 to 3, as prevail under the same rules in the Coast League, may be expected eventually.” (The Coast League, the Pacific Coast Hockey League, was a minor pro league with teams in western Canada and the western United States.) In 1930-31, NHL games averaged 4.79 goals, counting both teams.

The Boston American’s list of Bruins records that March included one more line: “No game lost in Canada this year.” Boston had won all eight of its regular-season games in Canadian rinks, and both semi-final games against the Maroons in Montreal. The defending champions then met the Canadiens in a best-of-three Final. The Canadiens won the first game 3-0 in Boston on April 1, so Boston’s perfect record in Canada was still intact.

On April 3, in Montreal, the Canadiens won 4-3 and took the Stanley Cup. It was Boston’s first loss in Canada all season, and the only time all season that the Bruins lost two games in a row. Boston scored all three of its Final goals that night. George Hainsworth, who had allowed less than a goal a game in 1928-29, was in the Montreal net for every one.

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Tests written down
Not in advance (exploratory)
Results computed

League totals for every NHL regular season from the NHL stats API (team and skater summaries), and every goal 1917-18 to 1964-65 from the NHL game feed, with its date, period, scorer and recorded assists. The offside test splits 1929-30 at December 21, 1929, and uses the same calendar split in the two seasons either side as a check. The by-team split, the named nights and games, hat tricks (three or more goals by one player in a game), Boston’s streaks and the 1930 playoff games come from the same feed; defencemen are identified by the position in the NHL’s season summaries. Best records: every team-season of 18 or more games since 1917-18 (1,758 of them; the minimum leaves out only the 1917-18 Montreal Wanderers’ six games, and the top record is the same with no minimum), ranked by points ÷ (2 × games). Newspaper quotes come from scanned pages at the Internet Archive; each quoted line was read against the page image, not only the OCR text, and lines we could not read in full were left out. How sure the offside drop is: the gap of 1.42 goals a game is about 3.4 times its standard error (each phase’s spread of goals a game divided by the square root of its games, combined). The check seasons are the same Dec. 21 split in 1927-28, 1928-29, 1930-31 and 1931-32.

Continues below

The assist split for 1929-30 compares the extra assists a team game with what the extra goals would have carried at the 1928-29 rate of 0.60 assists a goal; the rest comes from each goal carrying more assists than in 1928-29.

Every test we graded
TestResultVerdict
Scoring doubled in 1929-301.46 to 2.96 goals a team game (+103%); +66% against the three seasons before; all 10 teams upHolds
The biggest one-season change in NHL historyNext-largest move 23% (1928-29), across 106 season-to-season pairsHolds
The December 1929 offside fix cut scoring6.91 to 5.49 goals a game (n = 66 and 154 games; gap 1.42, standard error 0.41, about 3.4 standard errors); check seasons rose 0.57 after the same dateHolds
The fix hit every team8 of 10 down by more than 0.1 goals a game; Boston 4.08 to 4.07; Americans 2.00 to 2.81; 12-15 games per team beforeMost teams; too few games to explain who

More tests below

Rows 5–8 of 9
TestResultVerdict
Ottawa’s fall came from the ruleOttawa 4.78 goals a game in its first 9 games, 2.75 and no wins in 4 games from Dec. 7 to 19, before the ruleSlide began before the fix
The 1929-30 Bruins have the best record in NHL history38-5-1, .875 points percentage; next .830 (1943-44 Canadiens), among 1758 team-seasons of 18+ gamesHolds
The 10-5 game was the highest score yet (Sun-Telegraph)Feed has a 14-7 game on Jan. 10, 1920; the night’s 42 goals beat the previous one-night high of 33Not as a game; yes as a night
The 1929-30 assist jump was only bookkeepingUnassisted goals also rose (0.64 to 0.78 a team game)Does not hold

Continues below

Row 9 of 9
TestResultVerdict
The 1930s assist climb reflects more passingScoring flat (2.16 to 2.53 a team game, 1930-31 to 1938-39); two-assist share 19% to 63%Unlikely; looks like crediting

Frequently asked questions

When did the NHL allow the forward pass?

In steps: in the defending and neutral zones from 1927-28, into the attacking zone from the neutral zone in 1928-29, and inside all three zones from the start of 1929-30. A pass still could not cross a blue line.

How much did scoring go up in 1929-30?

Goals a game for each team rose from 1.46 in 1928-29 to 2.96, up 103%, the biggest one-season change in NHL history. Every one of the ten teams scored more.

Did the forward pass cause the 1929-30 scoring jump by itself?

Not on its own. The same 1929-30 rules limited a team to three players, goalie included, in its own zone once the puck had gone up the ice, stopped goalies from holding the puck and allowed kicking. The data cannot separate the forward pass from the rest of the package.

When was the modern offside rule introduced?

In the middle of 1929-30. The NHL governors voted on December 16, 1929, and the rule took effect on December 21: no attacker could enter the attacking zone ahead of the puck. Games averaged 6.91 goals before it and 5.49 after.

What is the best record in NHL history?

By points percentage, the 1929-30 Boston Bruins: 38-5-1 in 44 games, .875. That is the best of every team-season of 18 games or more since 1917-18. Next are the 1943-44 Canadiens (.830) and the 1976-77 Canadiens (.825).

Why were there so few assists in early NHL seasons?

Partly less passing and partly how scorers credited them. A goal carried 0.42 assists in 1917-18 and 0.60 in 1928-29. The 1929-30 jump to 0.84 came with more goals of every kind, but the climb to 1.55 by 1938-39 came mostly from second assists while scoring stayed flat, which points to changing scorekeeping. Sources disagree on the exact early rules for credit.

More in Rules

All How Hockey Changed research

Sources and method

  1. NHL stats (NHL.com), every season since 1917-18
  2. NHL stats API: team and skater season summaries; NHL game feed goals with assists
  3. NHL.com: Giving thanks for 100 years of NHL memories (forward-pass steps and the mid-season offside rule)
  4. NHL.com: Boston Bruins history (Art Ross and the forward pass, the 1929-30 season)
  5. Scouting the Refs: NHL historical rule changes
  6. Scouting the Refs: NHL historical rule changes (the 1929-30 rules and the December 21, 1929 offside rule)
  7. Scouting the Refs: Rule rewind on the 1929 forward pass and offside rule
  8. The Pink Puck: December 16, 1929, ruling offside (citing the Boston Globe, Dec 16-23, 1929)
  9. The Daily Colonist (Victoria), Oct. 16, 1929: Puck Rules Knocked Topsy-Turvy by the Eastern Officials (Internet Archive)
  10. Pittsburgh Sun-Telegraph, Nov. 20, 1929: the Pirates’ 10-5 win and James J. Long’s column (Internet Archive)
  11. The New York Times, Nov. 20, 1929: Chicago 5, Americans 1 (Internet Archive)
  12. The New Yorker, Dec. 7, 1929: the hockey column (Internet Archive)
  13. Edmonton Bulletin, Dec. 17, 1929: N.H.L. Moguls Make Change in New Rules (Internet Archive)
  14. The Christian Science Monitor, Dec. 17, 1929: the offside ruling and Newsy Lalonde (Internet Archive)
  15. Boston American, Dec. 23, 1929: Bill Grimes, Passing the Puck (Internet Archive)
  16. Boston American, March 19, 1930: A Few Reasons Why Bruins Are Champs (Internet Archive)
  17. Wikipedia: National Hockey League, Board of Governors (each team appoints a governor, usually its owner)
  18. Wikipedia: 1928-29 PCHL season (the Pacific Coast Hockey League, a minor professional league)
  19. Wikipedia: 1930 Stanley Cup Final (best-of-three format; Boston the defending champion)
  20. NHL.com: NHL historical stats now available (assist credit and the 2017 rebuild)
  21. The Hockey Writers: goal-to-assist ratios (quoting Total Hockey on early assist rules)

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