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Retroanalyse im Schach

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Meisterwerke

in der Retroanalyse

39 - Harold Cross

Fairy Chess Review, 1939

Gewidmet T. R. Dawson

[7n/1pp1pp2/6pp/8/1PPPp3/bRP3P1/Kp2PP1P/QNkBRrrn]

14+14. Schwarz am Zug. Ist e.p. legal?

[7n/1pp1pp2/6pp/8/1PPPp3/bRP3P1/Kp2PP1P/QNkBRrrn]

Lösung

Wh. caps are axb & bxc. Bl. caps are axb & dxe. Wh. cannot retract c2-c3 because of his wBd1. The cage unlocks by pushing the three Rooks one square to the right and inserting something on e1 so that the wBd1 can be extracted. Only a wN, uncaptured by bPdxe can go to e1.

Retract:

-1. d2-d4!! d5xNe4
-2. Ng5-e4 Rg2-g1
-3. Nf3-g5 Rg1-f1
-4. Rf1-e1 d7-d6
-5. Ne1-f3 h7-h6
-6. Bc2-d1 Kd1-c1
-7. Bd3-c2+

and everything unlocks just in time to avoid bl. retropat.

We see that last move must have been -1. d2-d4!! (and not -1. d3-d4??) so that -7. Bc2+ can be retracted later. Therefore, the en-passant capture is legal.


Solution by Philippe Schnoebeen