Black to play (32...?) "Easy"

Black is already up an Exchange, so it would be very easy (and maybe best) to return the material surplus with ...Rxb1 if it meant owning the light squares, or otherwise gaining an important tempo or square for the attack.

My first two candidate moves, Qf3 and Qb2, fail to 33. Qc8+ followed by mate. The lesson to be learned here? Look to see if your opponent has a threat, or if your king is in danger (like a weak back rank), or you may be wasting time by not properly evaluating the position.

This brings us back to my initial speculation that returning the Exchange may be best. In order to win quickly (because of White's mating possibility), returning the extra material is necessary.

Slightly odd problem, in the sense that black is already up the exchange. It is crucial to spot white is actually threatening a mate in two with 33.Qc8+ Rxc8 34.Rxc8+ Qd8 35.Rxd8#. For that exact reason black can't play Qf3, though he would like to. So:

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If the puzzle (32...?) is White to move, White gains the advantage with 32. Bd4! when play might continue 32...Qd8 33. Bxa1 Rxa1 34. Qe7 Ra8 35. Qxf7 Qf6 36. Qg6 Kg8 37. Qh7+ Kf8 38. Be4 Ra1 39. Rxa1 Qxa1+ 40. Kg2 Qd4 41. Qh8+ Ke7 42. Qh4+ Kd7 43. Bxd5 Qxd5+ 44. f3 Qd2+ 45. Kh3 Qe1 46. Qe4 Qa1 47. Kg4 Qb2 48. h4 (+1.16 @ 24 depth, Deep Fritz 14).

In the actual Tuesday puzzle position (32...?), I found the 32...Rxb1! 33. Rxb1 Qf3 possibility while trying to solve the position as White to move (i.e. 32. ?).

White's clearly decisive error appears to be <29. Be2?>, allowing the winning move <29...Ra4! > (-2.46 @ 21 depth, Deep fritz 14).

Instead, White can make a fight of it with 29. f4! when play might continue 29...Qh4! 30. Qd4! (30. Qc5 Rd8 31. Bf2 Rg6! 32. Bf1 Qxf4 ) 30... Rd8 31. Bf2 Ba8 32. Qc4 e5 33. Qxf7 exf4 34. Re1 Bc6 35. Re5 Rg5 36. Rxg5 Qxg5 37. Bd4 Ba8 38. Bg6 Qh6 39. gxf4 Bd5 40. Qf5 Bc4 41. Bb6 Bd3 42. Qh5 Rd6 43. Qxh6+ gxh6 44. Bxd3 Rxd3 45. Kg2 Kg7 46. h3 Kf6 47. Bc5 (-1.30 @ 35 depth, Deep Fritz 14) with drawing chances for white in a difficult Bishop and two Pawns versus Rook and one Pawn endgame.

Earlier in the game, White might have improved over <16. Nb5?>, allowing <16...Qb8! >, with 16. b5 Nb4! 17. Ne5! Nxe3 .

click for larger view

Position after 27.Qxb6
Black missed winning a pawn with 27...Bxg2 28.Kxg2 Qd5+ 29.f3 Qxd3;