| Feb-24-18 | | Marmot PFL: Found the double rook sac and Qxa2+, didn't find a win. Oh well, neither did black. Besides White could have played 29 Bb2 instead of 29 Qxh5 and wins exchange for a pawn so black did well to draw. |
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| Feb-24-18 | | Caissas Clown: Normally I'm furrowing my brow by Thursday. But this was quite easy for Saturday. |
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| Feb-24-18 | | JJF: Instead of 31 .. Qb1 why not 31 .. B3+. ? |
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| Feb-24-18 | | ChessHigherCat: I found the double rook sac, too, just because I knew it was a puzzle and white had too many options unless black plays Rxh5, plus it's a natural move to deflect the Q, and it doesn't leave white with any immediate follow-up. Then the second rook sac is virtually the only follow-up for black, but I couldn't find a mate, either, so I thought that couldn't be right. Isn't it rather unambitious to play and draw with equal material? |
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Feb-24-18
 | | ajk68: <JJF: Instead of 31 .. Qb1 why not 31 .. B3+. ?> 31... Qb1, was not played. If you meant 31... Bxb3 instead of Qxb3+, white wins: 1) +7.75 (21 ply) 32.Rxg7 Bc2+ 33.Ke3 Qa3+ 34.Kf4 Bxd1 35.Qxd1 Qb4 36.Rg8+ Kd7 37.Kg3 Qa4 38.Qh1 Kc7 39.Be3 Qxh4+ 40.Qxh4 Bxh4+ 41.Kxh4 Kc6 42.Ra8 Kd5 43.Bf4 Ke4 44.Kg4 Kd5 45.Rxa6 Kc5 If you meant 34...Bb3+, black cannot maintain the checks, does not gain material and finds himself in a lost position. 1) +2.65 (22 ply) 35.Kc1 Ba3+ 36.Bb2 Qc4+ 37.Kb1 Qe4+ 38.Ka1 Qa4 39.Bxa3 Qxa3+ 40.Kb1 Bd5 41.Rxd5 Qb4+ 42.Kc1 Qc4+ 43.Kd2 Qxd5+ |
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Feb-24-18
| | ajk68: <ChessHigherCat: ...Isn't it rather unambitious to play and draw with equal material?> Finding the draw is an achievement. Black had a lost game until White blundered 28. Nxh5? Black only gets the draw by sacrificing the exchange. I also was looking for a mating attack and couldn't find it. If I had better evaluation skills I probably would been quite pleased with realizing a draw was my best chance and finding it. |
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| Feb-24-18 | | diagonalley: hmmmmmm... black to play and draw... (ref. yesterday's puzzle) even more fascinating... not |
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| Feb-24-18 | | drollere: <Black had a lost game> show us the analysis to prove that. |
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| Feb-24-18 | | mel gibson: I tried many a different move as the solution with Stockfish 8.
Every other move led to a loss for Black.
The position is very complicated -
even safe looking moves are bad. |
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| Feb-24-18 | | patzer2: The double Rook sacrifice 28...Rxh5!, which forces a draw after 28...Rxh5! 29. Qxh5 Rxc2! = to solve today's Saturday (28...?) puzzle, is an option I didn't consider. I did look at a single Rook sacrifice with 28...Rxh5! 29. Qxh5 Be4?, but after 30. Bb2 +- (+2.75 @ 32 ply,Stockfish 80) it seemed to me White was winning. So I settled on 28...g6?, which unfortunately loses to 29. Nf4 Rd8 30. h5 g5 31. Nh3 +- (+3.66 @ 29 ply, Stockfish 8). P.S.: Adding to the difficulty of the puzzle is the fact White can make it far more difficult for Black with 29. Bb2! (diagram below): 
click for larger viewHere (diagram above) Black must play 29...Rxc2! (offering White a choice of two sacrificial Rooks) and find his way through the complications in the forcing line 30. Qxc2 Qc5 [] 31. Qd2 Qb4 [] 32. Qxb4 ± to ⩲ (+0.68 @ 37 ply, Stockfish 8), just to maintain drawing chances in an exchange down middle game. |
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| Feb-24-18 | | malt: Had the double rook sac
30.Qh8+ Kd7 31.K:c2 Q:a2+ 32.Bb2 Q:b3+ 33.Kb1 Qa2+ 34.Kc1 looks equal,
Maybe I should try 30.Qh8 Bf8
for 30.K:c2 Q:a2+ 31.Kd3 Q:b3+ 32.Kd2 Bb4+ 33.Ke2 Qc2+ 34.Ke3 Qe4+ 35.Kf2 Qf4+ 36.Ke2 Bc4+ |
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| Feb-24-18 | | morfishine: <28...Rxh5> leads to the thematic rook-sac on <c2> followed by a Queen check on <a2> |
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| Feb-24-18 | | malt: Missed 30.K:c2 Q:a2+ 31.Bb2 Ba3 32.Rb1 Q:b3+ 33.Kd2
(33.Kc1 Qe3+ 34.Kd1 Bb3#)
33...Bb4+ 34.Ke2 Qc2+ 35.Kf1 (35.Ke3 Qd2#)35...Bc4+ 36.Qe2 Q:e2# |
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| Feb-24-18 | | agb2002: Black has the bishop pair for a bishop and a knight. White threatens Nxg7+ and Bb2.
The white queen is overburdened with the defense of the knight and c2. This suggests 28... Rxh5 29.Qxh5 Rxc2 30.Kxc2 Qxa2+ and Black seems to have perpetual at least but White has 29.Bb2 and 29... Rxc2 (29... Rxe5 30.Qxe5 is probably winning for White) 30.Qxc2 Qc5 looks better for White. Since a move like 28... g6 looks too passive and allows 29.Nf4 with threats like Nxd5-e6 and an eventual demolition sac Nxg6, I think I'd play 28... Rxh5. |
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| Feb-24-18 | | Cheapo by the Dozen: Like other folks, I saw the core idea of the game line, failed to find a win, and also failed to realize that a draw was the desired outcome. |
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| Feb-24-18 | | saturn2: To my surprise I got the first four game moves: Divert the queen by exchange sacrifice RxNh5. Then threaten mate by Rxc2. (Inbetween check Qh8+ makes it only worse for white) then Qxa2 Qxb3 and somehow I guessed a black bishop check would decide. |
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| Feb-24-18 | | JJF: What I meant was what about 36. . . B b3+ ?
after 36...Bb3+ 37. Kc1 Ba3+ ... but after further review I guess that doesn't bear fruit for black either. |
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| Feb-24-18 | | stst: It's a long wind for either RR-sac or RB-sac. Two main lines
(A)28......RxN, 29.QxR Rxc2, 30.KxR Qxa2+, 31.Kd3 (Kc3 invites b4+ still Kd3) Qxb3+, 32.Ke2 (else will fork) Bc4+, 33.Kf2 (Ke1 invites Bb4+) Qc2+ Kg3 etc..
(B)28......Bf3 force take, 29.QxB Rxc2, 30.KxR Qxa2+ etc
Also may be the quiet move28.....Bb4 but doesnt seem promising......deserve a Sunday posting!! |
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Kibitzing
