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Chessville
From the
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White to move and force mate: Hint: White’s thematic attack forces Black to resort to multiple under promotions of pawns to knights. At one time or another in chess history, all three of these problems were presented with the exact same solution. Only one of the above fits the solution truly! The Story: As a student of chess history, this is one of most intriguing positions I have ran across. It is amazing that with White to move, White can force a win. These are three versions of the same thematic problem that has been around for over 50 years. Two of these positions were used in lectures by top Grandmasters for years, apparently not suspecting their version was flawed. The flaw was discovered as we entered the computer age. The corrected version of the study has only evolved recently. Okay -- Only one position above is correct. Study and click on your choice! I choose position A I choose position B I choose position C
No, this is incorrect.
1.Nf6+ Kg7 2.Nh5+? (flaw #1, 2. Bh5 does win for White, my computer says mate in 10 at that point. It is an ugly “brute force” win nothing like the pretty thematic endgame study) ... Kg6 3.Bc2+ Kxh5 4.d8=Q Nf7+ 5.Ke6 Nxd8+ 6.Kf5 e2 7.Be4 e1=N 8.Bd5 c2? (flaw #2, 8 ... Nb4! stops White's thematic winning ideas & wins for Black!) Thus White's plan will only work, if Black plays the 8... c2? move. We need to repair this position, so as to match up with the study. Try another position! This is the most common endgame study position cited in decades past, but no . . . this is incorrect.
The flaw is that this version actually allows Black to escape, many say with a draw, by... 4 … Kg4! Best play on both sides according to Fritz 7 after sitting on this position in the Deep Position Analysis mode for over 24 hours is: 5.Kc6 Ba3 6.Qd1+ Kxg3 7.Qe1+ Kf4 8.Qh4+ Kf3 with White having the upper hand, but still unclear. Thus after a couple decades of acceptance, this flaw of 4 … Kg4! was discovered and needed to be dealt with. Efforts were made to keep the solution the same, but to make some adjustment of the position to take the wind out of 4 … Kg4! This accounts for some of the more correct but lesser known versions of the study. Can you find the position adjustment to repair the starting position, so as to match up with the study solution? Try another position! You are correct! Thus . . .
1.Nf6+ (No good would be 1.d8=Q Nf7+ and Black still retains enough material for an easy win) … Kg7 2.Nh5+ Kg6 3.Bc2+! Kxh5 4.d8=Q Nf7+ ( Now 4...Kg4? allows a quicker brute force mating attack beginning with 5.Qh4+) 5.Ke6! Nxd8+ 6.Kf5 e2 7.Be4 e1=N 8.Bd5 c2 9.Bc4 c1=N 10.Bb5 Nc6 11.Bxc6 Nc7 12.Ba4 Nf3 13.Bd1 Ne2 14.Bxe2 any 15.Bxf3 mate - Solution works – no flaws! For the record, instead of placing a Black knight at h8, placing it at e5 would also work. But in the eyes of many, not as aesthetically pure.
Most helpful in my research related to the solution & the history of the problem, were:
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