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StrateGems

No. 31, Jul-Sep 2005

R0120 - Andrei Frolkin, Andrei Kornilov

StrateGems 31, Jul-Sep 2005

Retract -1. c5-c6 b6-b5 -2. b4xSc5 Se4-c5 -3. a7-a8=S Sg3-e4 -4. a6-a7 Sf1-g3 -5. a5-a6 Re1-e2 -6. a4-a5 Be2-d1 -7. a3-a4 Rb1-e1 -8. a2-a3 b2-b1=R -9. b3-b4 a3xBb2 -10. Be5-b2 Sg3-f1 -11. Bd6-e5 Se4-g3 -12. Be5-d6 Bd1-e2 -13. Bd6-e5 Sf1-h2 -14. Bh2-d6 Sg3-f1 -15. Kf1-g1 Sf5-g3


R0121 - René J. Millour

StrateGems 31, Jul-Sep 2005

Retract -1. f6xPg7 c2xRd1=S -2. e5xQf6 Qf4-f6 -3. Rf1-d1 Qc1-f4 -4. R~ Kb1-a2 -5. R~ d3xQc2 -6. Qa4-c2 Ka2-b1 -7. Qc6-a4 Kb1-a2 -8. Qc8-c6 Qe1-c1 -9. h5xRg6 Ra6-g6 -10. Qc6xBc8 b6xRa5 -11. Ra1-a5 Ra2-a6 -12. Qa4-c6 Qc1-e1 -13. Qd1-a4 Rc2-a2 -14. R~ Ka2xSb1 -15. R~ Kb3-a2 -16. Ra3-~ Ka4-b3 -17. Ra1-a3 Ra2-c2 -18. c2-c4 Kb5-a4 -19. d4xPe5 Ra8-a2 -20. c3xRd4 a7xBb6 etc.

A difficult monochrome retractor in which all four captures of the rooks are neatly forced. A black rook must come to a2 before c2-c4 is played, and therefore black must avoid a7-a5?? stopping the Ra8 from escaping to g6.


R0122 - Wolfgang Dittmann

StrateGems 31, Jul-Sep 2005

Retract -1. c5xRd6 Kd7-d8 (At any time, black can hasten the end: -1... Re8-e6? Bh8-g7! and 1. Ke7#) -2. Rd2-g2 Kd8-d7 -3. Rd3-d2! Kd7-d8 -4. Qd2-h2 Kd8-d7 -5. Qa5-d2 & 1. bc7#

White makes two clearances for his queen. Tries -3. Rc2-d2? and -3. Rd1-d2? spoil the mate.


R0123 - Klaus Wenda

StrateGems 31, Jul-Sep 2005

White would like to start -1. a5xb6ep and 1. Sc5, but he does not control a3. He remedies this by -1. Kc2-d1 Rf1-f2 -2. Kb1-c2 Rf2-f1 -3. a2xRb3! Ra3-b3 (Black has been forced to self-block a3) -4. Kc2-b1 Rf1-f2 -5. Kd1-c2 (keeping the queen out of b1, and avoiding -5. Kc1-c2? Qh8-h1! -6. ba6ep and 1. Sc5 Kb5[Ke8]!) Rf1-f2 -6. b5xa6ep and 1. Sc5#.


R0124 - Wolfgang Dittmann

StrateGems 31, Jul-Sep 2005

White wants to promote the b-pawn, but first he must tie up the watchful Rc7 and Bh1 by walking his king into checks. The departure of the king leaves a5 unguarded. Therefors, white must also retract b4-b5 and force the Ra2 to move so that Pb4 guards a5.

Retract -1. Kc3-b4 Rg7-c7 -2. Kd3-c3 c5-c4 -3. Ke4-d3 Rg2-g7 -4. Ke5-e4 Rg2-g7 -5. Kd5-e5! Rg2-g7 -6. f5xe6ep! The right moment for this uncapture. e7-e5 -7. Ke5-d5 Rg7-g2 Naturally black avoids Rg2-a2 as long as possible. -8. Kd5-e5 Rg2-g7 (-8. f2x~e3 is illegal - can't put a pawn behind an enemy pawn in Anticirce!) -9. Ke5-d5 Rg7-g2 -10. Kd5-e5 The point. Black can't retract Rg2-g7 again, because that would have caused a 3-fold repetition) Rg2-a2 -11. b4-b5 and 1. b8=Q#

Tries: -4. d5xe6ep?? e7-e5 -5. Ke50e4 Rg7-g2 -6. Ke4-e5 f3x~e2! and -4. f5xe6ep?? e7-e5 -5. Ke5-e4 Rg7-g2 -6. Kd5-e5 but now white's -9. Ke5-d5?? is the move that causes a repetition, and white must break the pendulum.


P0176 - Radovan Tomasevic, Zoran Sibinovic

StrateGems 31, Jul-Sep 2005

I) 1. e4 a6 2. Bxa6 f6 3. Bf1 Ra6 4. e5 Rd6 5. exd6 Nc6 6. dxe7 Nd4 7. exd8=N Ne2 8. Nf7 Kxf7

II) 1. Nc3 Nc6 2. Nd5 Nd4 3. Nxe7 Nxe2 4. Nc6 Qg5 5. Nxa7 Qb5 6. Nxb5 Ra3 7. Nxa3 f6 8. Nb1 Kf7

A beautiful miniature showing S rundlauf in one solution and bishop switchback and Frolkin S in the other.


P0177 - Mario Parrinello

StrateGems 31, Jul-Sep 2005

1. b4 h5 2. b5 Rh6 3. b6 Rd6 4. bxa7 Nf6 5. axb8=N Ra3 6. Nc6 Rb3 7. a4 dxc6 8. a5 Nd7 9. a6 Nb8 10. a7 Kd7 11. axb8=N+ Ke6 12. Nd7 Kf5 13. Nxf8 Qxf8

The 'invisible sibling' bS helps the second Frolkin wS get to f8 quickly.


P0178 - Jorge Lois, Roberto Osorio

StrateGems 31, Jul-Sep 2005

1. c3 h5 2. Qa4 Nh6 3. Qc6 dxc6 4. e4 Be6 5. e5 Bb3 6. axb3 e6 7. Ra4 Bd6 8. Rb4 Ke7 9. exd6+ Kf6 10. d7 Qg8 11. d8=R Kg5 12. d4+ Kh4 13. Rd5 a5 14. Rg5 axb4 15. d5 Ra5 16. d6 Rd5 17. d7 Rd2 18. d8=Q Rc2 19. Qd1 Qh7 20. Ra5 Rd8 21. Ra1 Rdd2

The Pronkin wR shields for the Pronkin wQ.


P0179 - Unto Heinonen

StrateGems 31, Jul-Sep 2005

1. e4 h5 2. Be2 h4 3. Bh5 e5 4. Ke2 Ke7 5. Kf3 Kd6 6. Kg4 Kc5 7. d4+ Kc4 8. Bd2 Ba3 9. Bb4 Qf6 10. c3 Qf3+ 11. Kg5 f6+ 12. Kg6 Rh6+ 13. Kf7 Rg6 14. Qa4 Kd3 15. Qxd7 Kc2 16. Qd8 Be6+ 17. Ke8 Bxa2 18. Bf8 Bc4 19. b4 Bc1 20. Rxa7 Kd1 21. Rxb7 Ra1 22. Ra7 Ke1 23. Ra8 Qd1