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Feb-13-23
 | | perfidious: Another old foe (Hoffman) features in this unusual (for Monday) POTD. |
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| Feb-13-23 | | Cheapo by the Dozen: If 41 ... Kb8, then 42 Be5 anyway, because Black can't both save the rook and defang the discovered check. That variation does make this more of a Tuesday puzzle IMO. No big deal. |
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| Feb-13-23 | | geeker: I didn't read carefully enough, and thought White was Asa Hoffmann! Cute puzzle, unusual for Monday. |
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| Feb-13-23 | | King.Arthur.Brazil: The lonely tactic present is that after 41. Rc7+ Kb8 42. Be5 and Black cannot avoid to lose material due to undiscovered checks, like 43. Rc2+, in cases of Black ♖ moves on the 2nd rank, or 43. Rh7+ in case that it moves in the 'h' column. If Black protects the ♖ fall by 42... Rd2 or Rf2, White win the ♘ with 42. Rc4+ and 43. Rxe4. Doesn't work also 42... Ng3 43. Bxg3 Rg2 (or Rh3) 44. Rc3+ and White keep the ♗ surplus. Good week! |
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| Feb-13-23 | | mel gibson: Very easy.
White is already 2 pawns ahead so just swap off the Rooks and onwards to victory.Stockfish 15 says mate in 25:
41. Rc7+
(41. Rc7+ (♖f7-c7+ ♔c8xc7 ♗f6-e5+ ♔c7-d7 ♗e5xh2 ♔d7-e6 b2-b4 ♔e6-d5 ♔g6-f5 ♘e4-d2
g4-g5 ♘d2-f3 ♗h2-g3 ♘f3xg5 ♔f5xg5 ♔d5-c4 ♗g3-d6 ♔c4-d5 ♗d6-c7 ♔d5-c4 ♗c7-a5
♔c4-d5 ♔g5-f5 ♔d5-d6 ♔f5-e4 ♔d6-c6 ♔e4-e5 ♔c6-d7 b4-b5 ♔d7-c8 ♔e5-d6 ♔c8-b7
♔d6-c5 ♔b7-b8 ♔c5-b6 ♔b8-a8 ♔b6-c6 ♔a8-a7 b5-b6+ ♔a7-a6 b6-b7 ♔a6-a7
♗a5-b6+ ♔a7-b8 ♗b6-c7+ ♔b8-a7 b7-b8♕+ ♔a7-a6 ♕b8-b6+) +M25/82 1108) White wins _ mate in 25. |
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| Feb-13-23 | | saturn2: <Brenin: 41 Rc7+ Kb8 42 Be5 and either Bxh2 or a deadly discovered check winning the N> Being pedantic by 42...Re2 black saves the knight but loses the rook after 43.Rc2. |
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| Feb-13-23 | | jrredfield: I found 41 Rc7+ and saw how 41 ... Kb8 wouldn't work because there's no place where Black can hide the rook after 42 Be5. I agree with <Cheapo by the Dozen: That variation does make this more of a Tuesday puzzle IMO>, but still pretty straightforward. |
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| Feb-13-23 | | stacase: 41 Rb7+ reduces Black to a King and Knight. It's a won game for White. Yes one of those little sayings when you post says, "The hardest game to win is a won game" |
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| Feb-13-23 | | agb2002: White has a bishop and two pawns for a knight.
White can push the black king to a dark square with 41.Rc7+: A) 41... Kxc7 42.Be5+ and 43.Bxh2 with a more easily won ending. B) 41... Kb8 42.Be5
B.1) 42... Rxb2 43.Rc2+ and 44.Rxb2 + - [R+B+P vs n]. B.2) 42... Rd2 43.Rc4+ Nd6 44.Rc6 wins the knight. |
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| Feb-13-23 | | TheaN: Nifty simplification! White goes into a winning piece endgame after <41.Rc7+>, given <41....Kxc7 42.Be5+ with Bxh2 +->. If Black tries to be clever with 41....Kb8 (which may well be the best attempt!) it ends faster after 42.Be5 +-, as Black can't defend against the direct attack on Rh2 nor the discover, ie 42....Rxb2 43.Rc2+ +- (not Bxb2? Kxc7=). |
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| Feb-13-23 | | TheaN: I guess the discover is not as clearcut however; after 41....Kb8?! 42.Be5 Rd2! Black defends the rook: of course 43.Rc4+, hitting Ne4, Nd6 44.Rc6 +- wins the piece and the game. Likewise, 43.Rc2+ +- still forces a rook trade and the game line ensues, but is not optimal then. |
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| Feb-13-23 | | Once: What I find interesting here is that the solution doesn't win material. It's rook for rook. But what it does do is to force the exchange of rooks which in turn accentuates white's material advantage. That sits a little oddly with the FAQ definition of what constitutes a solution, but it's clearly the best move in the position. Maybe the FAQ needs to be refined? |
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| Feb-13-23 | | goodevans: <Cheapo by the Dozen: If 41 ... Kb8, then 42 Be5 anyway, because Black can't both save the rook and defang the discovered check.> Yes, but that's only true because Black's own N gets in the way. If the N were elsewhere then Black's R could just keep harrying the B starting with 42...Re2. Of course, White would still have a huge advantage because of the two extra pawns but he couldn't make the win routine by forcing the trade of rooks. |
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Feb-13-23
 | | chrisowen: Mariner pod c v it's hook silly fly que it's z Rc7+ mini axiom jab affable pad clinch it's Rc7+ dud :) |
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Feb-13-23
 | | Jimfromprovidence:
I altered the FEN string to put white's b2 pawn on a2. Now does 41 Rc7+ still work?
click for larger view |
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| Feb-13-23 | | jrredfield: <Jimfromprovidence:
I altered the FEN string to put white's b2 pawn on a2. Now does 41 Rc7+ still work?>Not as quickly, but 41 Re7 (not Rc7+) is probably best: 41 Re7 Nf2 42 g5 Nh3 43 a4 Rc2 44 Re4 Rf2 45 Re3 would probably put White ahead significantly. |
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Feb-13-23
 | | steinitzfan: I like the simplification. When I'm a couple of pawns up, generally I'll get as many pieces off the board as possible. The one-minute analysis from the provided engine shows no preference for the simplification. My guess is that engines just don't fear making blunders. |
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| Feb-13-23 | | Chesschronicle22: It took ke under 10 seconds to find the answer, if you understand what white needs (in this case its promotion) simply find what is the most problematic to achieving the goal (in this case its the rook), so simply force take/kill the rook. Simple :) |
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| Feb-13-23 | | Chesschronicle22: <steinitzfan: I like the simplification. When I'm a couple of pawns up, generally I'll get as many pieces off the board as possible.
The one-minute analysis from the provided engine shows no preference for the simplification. My guess is that engines just don't fear making blunders.>
exactly :) |
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| Feb-13-23 | | whiteshark: That was indeed easy. |
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| Feb-13-23 | | Cheapo by the Dozen: 42 ... Rd2 in the discovered check line is exactly the kind of thing that makes me say this isn't quite a MONDAY puzzle. On the other hand, White can very simply force the same kind of rook exchange the game line did. Or, if he prefers, he can win material by attacking black's knight, and gaining either that piece or else rook-for-bishop depending on how Black responds. |
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Feb-13-23
| | Jimfromprovidence: <jrredfield> With white's pawn on a2 41 Rc7? now leads to a draw (or stalemate). This is because black can force a simplification of the position where white ends up a rook pawn and a bishop ahead. The problem is the bishop is not the same color as the queening square. Here is the line below. 41 Rc7+ Kxc7 42 Be5+ Kd7 43 Bxh2 Nf2 44 g5 Nh3 45 Kf5 Nxg5 46 Kxg5. 
click for larger view |
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| Feb-13-23 | | WickedPawn: Black’s problem is that the K is on f6 so white promotes with check. Otherwise, 46 …,Nxh2, followed by 47 …,Ng4 would be a draw. |
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Feb-13-23
 | | eternaloptimist: This was an easy but cool puzzle. Arcija’s restricted ♔ & the double attack from the ♗ set up the combination |
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| Feb-13-23 | | devere: 41.g5 wins easily. Or to put it another way, not all rook endings are drawn. |
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