Monday, March 31, 2008

Multiple pawn promotions

In the (first prize awarded) Miniature of Abdurahmanovic we see the theme multiple promotions during the four phases of the trial game, and also the theme X-flights after the key.

 Theme Multiple pawn Promotions (German: allumwandlung, AUW) : The solution contains pawn promotions to all kind of pieces. We have quadruple promotion, to queen, rook, bishop, knight.

 Theme X-flights : The king can escape moving diagonally (northeast, northwest, southwest, southeast).

 (Problem 15) Fadil Abdurahmanovic, First Prize "Yugoslav Republic Tourney", 1957 White plays and mates in 2 moves #2 (6+1) [5QKB/2P5/8/3k4/8/1R4S1/8/8]

Let us try to promote the pawn:
First Phase : Try {1.c8=Q? (not good, because black is in stalemate!)}
Second Phase : Try {1.c8=R? Ke6!}
Third Phase : Try {1.c8=B? Kc6!}
Fourth Phase : Try {1.c8=S? Kc4!}
Last Phase : Key 1.Se4!
Suddenly the knight is sacrificed. The black king has now one more flight, a total of four flights arranged in the shape of the letter X. But black is in "zugzwang", that is, whatever he plays leads to a lost position.
1...Ke6 2.Qf7#
1...Kc6 2.Qd6#
1...Kc4 2.Qf7#
1...Kxe4 2.Qf3#

In the problem-16, by Millour and Kerhuel, we see the X-flights and the multiple promotion of a pawn in the variations of the actual play.

 (Problem 16) R. J. Millour & M. Kerhuel, First Prize, "Europe Echecs", 1966 White plays and mates in 3 moves #3 (9+7) [3sR3/3s4/2P1P3/4kBp1/S2S2p1/PQ4p1/6p1/6K1]

Key: 1.e7!
If black moves the knight of the eighth row,
1...S8~ 2.Qe6+ and 3.Qe4#
If black moves the knight of the seventh row,
1...S7~ 2.exd8=Q+ and 3.Qe3#
There are also the X-flights of the king,
1...Kf4 2.exd8=S [3.Qe3#] Se5 3.Se6#
1...Kf6 2.exd8=Q+ Kg7 3.Qxg5#
1...Kd6 2.exd8=R Kc7 3.Rxd7#
1...Kxd4 2.exd8=B [3.Re4#] Se5 3.Bb6#

1. Could black use multiple promotions as defending mechanism? Yes!
2. For the defensive promotions Q R B S of the black, could white make respectively promotions Q R B S to continue his attack? Yes!
We will see that later, when we will describe the Babson task.

[This post in Greek language].