This position occurs in csotibi (1575) - roy_arav (1610) after 24...Re8. White is worse and his best plan is probably Na4-c3-e2-f4 and h4 to fortify his King. But Roy's opponent apparently thinks he can exploit the potential pin on the c file with 25.Nxc5 Bxc5 26.b4 ... and the piece would be recovered after the flight of the Queen from the file. But Roy has a surprise for his Hungarian opponent: 26...Bxf1!? (He could have played 26...Qd7, as well, and White would have more defensive material but less space to maneuver near his King.) Now, after 27.Rxc5 Qd7 28.Kxf1, but the piece is not so easily collected, as black has not passively repositioned his Queen! Black now has 28...Qxh3+ 29.Ke2 Qg4+ (Black also had 29...Rf2+!? 30.Kxf2 Qh2+ and the White Queen falls.) At this point, White blunders with 30.Kd2?? so 30...Rxf2+ ends the game. But the question to the team is this: how should Black continue after the alternative 30.Kf1? [Hint: there is a mate in four, including a futile sacrifice.] White's best defense was 30.f3 exf3+ 31.Kd2 Qxg3 32.Kd1 (has to both get out of the second rank and protect the rook) 32...f2 and there is still a chance that Black could err in finishing off his opponent.
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