In the game lichess.org/J37PslWv1CAn, both players did not play the rare 7-piece endgame KPPNvsKBB correctly:
In move 65, black (the pressing side) entered it as a theoretical draw. In move 71 white allowed a cursed black win (still a draw by 50-move-rule), and in move 72 even a real black win, but in move 75, black did not find the only move that won fast enough but let white slip back into a blessed loss.
In move 65, black (the pressing side) entered it as a theoretical draw. In move 71 white allowed a cursed black win (still a draw by 50-move-rule), and in move 72 even a real black win, but in move 75, black did not find the only move that won fast enough but let white slip back into a blessed loss.