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The objective of both the puzzles is mate in two. In the first one Kd6 is the best move to a mate in two. If Qe5 then black blocks it with c5. The theme is cross-checks. That is white blocks a check while giving a check at the same time. It's the case in the second one too. I guess now its easy.
Anyone got the second one? Come on Turm have a try.
You are right, if the king takes g5 it's drawn and Houdini shows wrong evaluation. What I used though, IvanHoe with 6 men Robbobases, leads the king to the 3 rank, and then to c5, or manages to block the checks with the rooks. It defends wrongly sometimes (c7-c5 even when it can check), and I intervened and checked instead, and it managed to make progress after a while. I don't understand the pattern, and sure enough the engines don't understand the pattern, but still they solve it with a bit of luck (or outside guidance).
Blocking the checks is never possible.Running straight to c5 is impossible as well. (Kd5 is answered with c6+ and Kc5 Rf3 is now a draw). So how to win?
I studied the engine's moves and here is what I think it does.The obvious problem is that White has two rooks pointed at a3, which means the Black King can't take it, and if KxR after c7-c5 White hasn't time to move both rooks and it's stalemate.So White needs to stop the checks, to move a rook.1.Bf5 Qh7+ 2.Bxh7 Rxh7+Now the King heads to the 2nd rank. 3.Kg6 Rh6+ 4.Kf5 Rf6+ 5.Ke4 Re6+ 6.Kd3 Rd6+ 7.Ke2 Rd2+Notice that after Re6+ White can block the check with the rooks.8.Ke3 Re2+ 9.Kf3 Rf2+ 10.Ke4 Rf4+ Black can't check to Re2 cause White can block.11.Kd5 Rd4+ Not Rf5+ cause then gxf5 and the g5 pawn can move. That's why White doesn't take g5 with the king initially.12.Kc5 Black can't check with Rd5+ cause 13.cxd5 c6 Rc4#.So Black must either make a waiting move with the rook or move c6. But now White can move one of the rooks away from the 2nd rank. The rest is easy I think. Let me know if there are other better moves for Black.
11. ... Rd4+(?) is pretty weak. Black plays 11. ... c6+. How do you continue?
Sutirtha11, my solution to your 2nd problem (post n0.13) is 1. Rb1! (Threat 2. Bg4/h5#) If 1...exd2+ 2. Nd3. Or 1...e2+ 2. Bb3#. Finally 1...exf2+ 2. Bf3#.
The problem features crosscheck and self-block. Black pawn made a self-block to his own King. Squares d2, e2 and f2 is blockaded which White exploited brilliantly!
But what if black simply checks on d6?
1. Rb1(!?) Qd6+ and I don't see any mate.
Asorski is correct.
Because of what? There are 3 ways to mate in 3 moves.
1. Rb1 is by far the most beautiful, but the crude Rxe3 and Bxg3 will also work.
Did you miss a piece? Maybe a black pawn on d6?!? Or maybe better put the rook to f4, not f5?
Turm, I did not miss a piece but I think Black won't do anything foolish. Both these puzzles came out in a magazine and this was the answer provided and the main theme like I and Asorski said is cross checks and self blocks.
Regarding the second puzzle by Turm Breuburg... It is indeed a very tough puzzle, and I could at max force a draw against Shredder (Depth 16). Thank you so much for posting the puzzle...
Now I am very anxious to know the solution that would lead to the score of 1-0. Please do let us know :)
Then it was printed wrong. This is clearly meant as a mate in 2 problem, but like this it is a very bad mate in 3. The first one is certainly a correct and quite nice #2 (yet not too difficult). But the second one will like this not even count as a real problem as it has multiple solutions and the main line is rather poor.
I might guess the rook has to be on f4 instead of f5. Then it is would be a correct problem (but very easy, as Rb1 is a rather obvious key)This also allows the defence Qg6 which is countered with Ng4#, blocking the g-file against Qg3. This might make it a real chess problem and I guess this was how it was meant to be.
The second puzzle from me is way more easy than the first one and any good engine can find the correct solution.
yours are excellent puzzles turm and I think rook was on f4 I don't have the magazine now
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