PawnSac: game 1355325
< 10. ..Nxe5?! >
The way to refute an unsound sac is to take it, though sometimes that requires steady nerves and hoevos grandes!
< 12.Ke2 >
On 12.g3 black plays either ..Qe4+, or ..Bxc3+ and then ..Qe4+
< 17..Qh5 >
Threating ..Rxe4 Kxe4?? Qf5#. A cute little mate.
< 23.Kc2 >
Mark has been skating on thin ice, but has managed to hold the extra piece. Now it seems white has plenty of resources against ..Qg6+. For example, 24.Bd3 Nxd3 25.Qxd3 Rc8 Kd1 is simple enough. White prepares to bring his rook into the game with Rc1, while blockading the D pawn.
Black needs some tactics, but his options are few.
< 23...d3+ >
Hey, its a try.
< 25.Nxe5 >
The black bishop has been lured off the a3-f8 diagonal, and the back rank is weak, so the knight is immune.
<25. ..Qe6 >
Now white must work on a plan to activate the rook, and get the K to shelter.
< 26. ..Be3 >
to keep the R off c1
<27. ..b5 >
Black must get more material involved in the battle, but this plan works against him.
< 30.Qf3! >
White threatens to liquidate material with Ra8, so black's reply is pretty much forced.
< 31.Ne5! >
Taking advantage of the weak back rank again, while trying to overload black's pieces. 3 points of attack:
f7, b5, and e3.
< 32.Bxb5! >
Better than 32.Qxf7+ Kh8 33.Nf3 (to shield Bf1 against Rf8) which only wins a pawn but does not improve the position. Bxb5 wins a pawn, develops another piece, and forces the rook to a more passive square (the threat of Qxf7 is stronger than it's execution).
Both capture possibilities are no good:
..Rxe5? 33.Ra8 or
..Bxe5? 33.Bxe8 Qxe8 34.Ra8 Bb8 35. Qb7 Qe1+ 36. Ka2 Qe6+ 37. Qb3!
The rook and f7 are both attacked. The only reply is Rf8.
< 33. ..Bc5 >
..Bf6?! is really no better. 34. Qf5 still forces the Q trade since ..Qe8? 35. Bd3 g6 36. Qxf6 Qe1+ 37. Kc2
< 34. Qf5! >
Black is busted, and could have resigned here. The Q trade is virtually forced, after which he has no game left. White finds instant freedom of activity.
i.e., ..Qxf5 35.gf and what is black to do?
( ..Re8? Ne7+! or even b4! ) For example; 35. ..g6 36. b4 Bd6 37. Bd3 Rc8 38. b5 Kg7 39. fxg6 hxg6 40. Ra7 Bc5 41. Rd7 Bb6 42. Bc4 Rf8 43. Ne5
< 35 ...Qe1+ >
Black is down 2 pieces but just refuses to resign (apparently hoping for a blunder like Kh2? Ra8+) ! So white just as stubbornly holds all the material, and with patient maneuvering runs black out of play.
(( With the overwhelming material advantage, even a 1600 player could win by simplification with reckless abandon..
36. Kc2 Qxa1 37. Ne7+ Kh8 38. Ng6+ hxg6 39. Qxf8+ Kh7 40. Qxf7 and after a move such as ..Qa5 41. Bd3 Qc5+ 42. Kb1 Qg1+ 43. Ka2 Qb6, white continues to forcibly strip the position to an elementary win with 44. Qxg6+ Qxg6 45. Bxg6+ Kxg6 46. b4 Kf6 47. Kb3 Ke5 48. Kc4 ))
< 40. ..g6 >
to blunt the attack on h7. If 40. ..Qe1+ 41. Qc1 Qe4+ 42. Bc2 Qxc6 43. Bxh7+ wins the Q.
< 41.Ra3 >
Black resigns as there is nothing left.
After ..Qe1+ 42.Ka2 Qe6+ 43.Bb3 the rook exchange is forced, and
...Rxa3+ 44.ba Qxg5 45.Ne5 is too humiliating.