IGS 7d vs 6d: KataGo Reveals the 97%→1% Blunder

Two high-dan players battle to a half-point finish in a game that drew 26 live spectators on IGS. For 233 moves, White built a commanding 97% win probability—then a single move at O11 (KataGo's top choice was O12) flipped the board state entirely, handing Black a 99% advantage. Black nearly threw it back on move 261 (T14 instead of O1), but White couldn't capitalize. KataGo's post-game analysis reveals why these moves—logical in the heat of battle—carried hidden traps that only perfect play could exploit. At this level, you'd probably play the same way.