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| Dec-21-05 | | LIFE Master AJ: I must still be asleep. I did not (seriously) look at at Qb5, and settled for the win of the Pawn at e6. I think I did what a lot of people did. I initially thought the solution was impossible, due to ...Rd1+. (It's a double pin, these can be tricky. I remember a 2400+ missing a similar idea entirely in a "Game-in-60" encounter.) |
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| Dec-21-05 | | Soltari: I like this puzzle theme as well, I didn't find monday to wednesday, so my pinning skills must be awfull :). I guess it's hard for me to find a pin after an imaginary exchange because you can't actually see the pieces on the board yet. |
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| Dec-21-05 | | prinsallan: Fine win and too hard for me today. Merry Christmas and Happy New Year to all, c u all next year. |
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| Dec-21-05 | | Rama: Pachman's "Modern Chess Strategy" helped me a lot in the 70's, especially the chapter on Rooks. I can still quote him, "The purpose of Rook operations on an open file is penetration to the 7th or 8th ranks." |
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| Dec-21-05 | | Tariqov: <mymt> i see you saw your mistake |
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| Dec-21-05 | | mymt: <zhentil> sorry miss read <panthercat & HannibalSchlecter> thought they said 26.Qa4? when 26. ...Rxc7 27.Qxe8 Rxe8 gives Black a R |
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| Dec-21-05 | | YouRang: I missed it. I quickly grabbed the 26. Rxe6. Bah, humbug. Good puzzle though. |
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| Dec-21-05 | | patzer2: Today's puzzle solution, 26. Rdxd7+! Rxd7 27. Qb5!  , wins with an interesting double pin against the Black Rook on the d7 square.
In the final position, after 27. Qb5, the pin by the White Rook on c7 restricts the movement of the Black Rook on d7 to only hornizonal moves along the seventh Rank and prevents it from moving vertically along the d-file. Black has at least two moves (27...Rxc7 and 27...Re7) to try and minimize the damage in the final position. However, they both lose quickly. If 27...Rxc7 28. Qxe8 , then White goes up a Queen for a Rook with decisive material advantage. If 27...Re7, then 28. Qxe8 Rxc7 leads to the same result. |
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| Dec-21-05 | | patzer2: I've always been fascinated by the pin tactic. According to Reinfeld in his "1001 Winning Chess Sacrifices and Combinations," which has 108 example puzzles on pinning, "the pin is by far the most frequently used tactical theme." Doing a little research on the Chess pin tactic on the internet this morning I found: 1. A good encyclopedia article on the Chess "pin" tactic at http://en.wikipedia.org/wiki/Pin_%2... 2. A good working definition of the pin, at http://www.angelfire.com/games5/che...: "Pin: One of the most important tactical devices in a chess game. A piece is pinned when it cannot move away from an enemy attack because it is shielding a more valuable piece behind it. If that piece is the king, then the pin is "absolute" because the pinned piece may not legally move. If the shielded piece is any other type, then the pin is "relative" because the pinned piece has the legal option to move." 3. An excellent discussion of the Pin in an online PDF version of GM Leonid Shamkovich, GM Ray Keene and NM Eric Schiller's "Killer Chess Tactics" at http://www.ericschiller.com/pdf/Kil... Scroll down to pages 31 through 36 for a great explanation of the terms "absolute pin, relative pin, terminal pin, St Andrew's Cross, Oblique Cross and Triple pin." 4. A discussion of the pin tactic for beginners at IM Silman's site at http://www.jeremysilman.com/chess_i.... 5. An article at http://www.jeremysilman.com/chess_h... by GM Larry Christiansen, for more advanced players on using the pin as an attacking weapon. 6. An entire book on the Chess pin tactic by ICCF Master Victor Charushin, as described at http://uscfsales.com/item.asp?cID=7.... P.S. Just curious if anyone here has read this book and would recommend it or any other Books for in-depth definitions, explanation and coverage of the pin tactic. |
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| Dec-21-05 | | TTLump: The initial position does not really qualify as a pin, because black can take the "pinning" piece with the "pinned" piece or move the rook anywhere along the 7th rank. When you look at the potential pin created by 26.Qb5 ... you think, OK, but what does this pin accomplish? Nothing, because the Queen is protected by the rook at d8 and Black could still take the rook on C7 with impunity, but then you realize, wait a minute, if there was no rook on d8, then Qb5 WOULD be an effective pin, and then it hits you, the d8 rook is an OVERWORKED PIECE! It protects the Rook on d7 AND the Queen on e8, and it can't do both, so you have to understand that there isn't really an effective pin at the start of this position, but you can CREATE an effective pin by exploiting another common weakness, the overworked piece! The other slightly unusual thing about this position is that normally, a pin wins because you can keep adding attackers to the pinned piece and your opponent can only add protectors, he can't move the piece, while in this case the extra attacker was already in place (the rook on c7), and you simply supplied the pinning piece! One technique I find often works in this type of position, is that instead of trying to find a winning move sequence, I look for a winning position, and then I look at all the potential move sequences that can get me to that position. |
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| Dec-21-05 | | kevin86: I saw 26 ♖e6 but I think the saving clause (not Santa) is ♕f7 |
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| Dec-21-05 | | patzer2: <TTLump> You are correct in indicating 26. Rdxd7+ is not per se a pin itself. It is a deflection/decoy move to force 26...Rxd7 to set up the winning pin 27. Qb5! However, since this resulting double pin or cross pin is the decisive tactical move in the forcing sequence, the combination is classified as a pinning combination. This is a general principal used in the classification of combinations, per Informant's 1980 "Encyclopedia of Chess Middle Games/Combinations." |
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| Dec-21-05 | | TTLump: just to correct an impression I might have left with my last post. The final position is really a double-pin and both the Queen and the Rook qualify as pinning pieces in this position and both pins are crucial to the position. The move I hadn't considered in my earlier analysis was 27... Re7, which doesn't work ONLY because of the pin by white's rook on C7 (white can take black's queen because of this pin). |
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| Dec-21-05 | | trumbull0042: Boy did this one take me a while. |
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| Dec-21-05 | | Antipholous: I saw 26.Rxe6 Qxe6 27.Qxe6 Rxc7 28. Qf6+... 29. Qxc8 Does that work or is there a way out I'm not seeing? Granted this pin is much better leaving you with a Rook and a Queen against a Queen instead of a Queen against a Rook. |
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Dec-21-05
 | | Gypsy: <Antipholous: I saw 26.Rxe6 Qxe6 27.Qxe6 Rxc7 28. Qf6+... 29. Qxc8 Does that work or is there a way out I'm not seeing?> 26...Qf7 |
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| Dec-21-05 | | Deadly Pawn: Would members be willing to list books that they think might be of interest? |
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| Dec-21-05 | | erimiro1: Take a look again at the combination: it's so short (only 2 moves) and the moves themselves are so short (only one square each), but yet, so many found it hard to find! Why? Because the idea behind it is not an obvious one, and as I mentioned earlier, human mind has difficulties in cases of pins between the same pieces. |
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| Dec-21-05 | | YouRang: <TTLump: The initial position does not really qualify as a pin, because black can take the "pinning" piece with the "pinned" piece or move the rook anywhere along the 7th rank.> That's the first time I've heard that restriction on the definition of "pin". Consider the following position (black to move):
click for larger view
Even though the pinning piece (the rook) can be taken with the pinned piece (the queen), and the queen can move anywhere along the g file, wouldn't it still qualify as a pin? Why can't the queen move to, say, d5? I think the answer is: "because it is pinned". |
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| Dec-21-05 | | trumbull0042: Chessgames.com, thank you so much for the pedagogical approach you are taking to these puzzles. I also like how common themes come back again and again. It's a great way for us to learn them well. |
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| Dec-21-05 | | McCool: i thought i had it with the Rxe6 thing but then i couldn't finish it because ...Qf7 kind of ruins it all. |
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| Dec-21-05 | | BishopofBlunder: Well, so much for my "Nimzo-Indian" theme guess...
I might help in guessing weekly themes if I remember that these puzzles go into the Tactical Archive, not the Opening Explorer. |
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| Dec-23-05 | | LIFE Master AJ: <You Rang> You are 100% correct. |
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Jan-31-10
 | | FSR: Couldn't Black have equalized with 15...Qb6? |
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Mar-11-15
 | | tpstar: White to Play and Win after 25 ... Rfd7.
A famous cross-pin. |
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