Yesterday's Chinese City League game Zhou Hexi 4-dan vs. Tong Yulin 4-dan. The game has 377 moves (or 394 moves if counting dame moves). This is among the longest professional games.

http://www.go4go.net/go/games/sgfview/33220

It says:



At which point did black resign?

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I understand some Chinese players have the habit to play all the yose moves and start discussing the games immediately with opponent, when the outcome of the game is apparent. Such games will be recorded at B+R or W+R.