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feenschach

Awards Informal Tourney 1997/1998 - SOLUTIONS
Judge: Thomas Brand

1 - Andrei Frolkin
feenschach 130, No. 7517

The retroplay is: -1. .. d5-d4 -2. f2-f3 e6xBd5 -3. Ba2-d5 d7-d6 -4. Qa1-b1 f5-f4 -5. Rb1-b2 f6-f5 -6. Qe5-a1 f7-f6 -7. Bd5-a2 Ka2-a3 -8. Bf3-d5 Ka3-a2 -9. Qh5-e5 Ka2-a3 -10. Rb3-b1 Ka1-a2 -11. Rc3-b3 Ka2-a1 -12. Rc4-c3 and now unpromote both Rc4 and Qh5 on h8, retract the pawns to h2 and h4, and further retraction requires: -25. g3xPh4 Ka2-a1 -26. Be4-f3 Ka1-a2 -27. Bd5-e4 h5-h4 -28. Ba2-d5 h6-h5 -29. Nb2-a4 h7-h6 -30. Ra3-a5 Qa5-b6.

A try is to uncapture a knight on the 2nd black move, but this will result in black retrostalemate, because the knight requires 2 moves to reach a2, instead of 1 by a bishop.


2 - Dirk Borst
feenschach

1. d4 c5 2. d5 c4 3. d6 c3 4. Qd5 Qa5 5. Qc6 dc6(=w) 6. c7 Bg4 7. c8=N e6 8. Ne7 Qf5 9. Ng6 hg6(=w) 10. d7 Ke7 11. d8=B Kd6 12. Bdg5 Ne7 13. Bh6 gh6(=w) 14. g7 Ng6 15. g8=Q Be7 16. Qd8 Ke5 17. Qd1 Rc8 18. h7 Rc4 19. h8=R Nc6 20. Rd8 Rc8 21. Rd2 cd2(=w)


3 - Gianni Donati
feenschach 126, No. 7246

1. Nc3 c5 2. Ne4 Qb6 3. Ng5 Qg6 4. Nh7 Nc6 5. Nf6 ef6 6. e4 Bd6 7. e5 Bb8 8. e6 d6 9. e7 Bf5 10. c3 Kd7 11. e8=N b5 12. Nc7 b4 13. Nb5 a5 14. Na3 a4 15. Nb1 Bb1


4 - Andrei Frolkin
feenschach 130, No. 7514

Retro play is: -1. Na4-b2 g6xBh5 -2. Bg4-h5 f7xRg6 and now:

(I): -3. Bh3-g4 e4-e3 -4. Bf1-h3 e5-e4 -5. Rg1-g6 e6-e5 -6. g2xBf3 Bd5-f3 -7. Rh1-g1 Ba2-d5 -8. Qa1-b1 Bb3-a2 -9. Qc3-a1 Ba2-b3 -10. Qc6-c3, and then Kc1-a1; bBb1; Rd2-e1; wQd1; bB out; wK out

(II): -3. Be6-g4 e4-e3 -4. Ba2-e6 e5-e4 -5. Rg1-g6 e6-e5 -6. c3xPd4 d5-d4 -7. Qa1-b1 d6-d5 -8. Kb1-c1 d7-d6 -9. Rc1-g1 Rd1-d2 -9. d2-d3 etc.


5 - Andrei Frolkin
feenschach 130, No. 7516

1. h4 Nc6 2. h5 Ne5 3. h6 Ng4 4. hg7 h5 5. c4 h4 6. c5 h3 7. c6 h2 8. cb7 Rh3 9. b8=R N8h6 10. g8=R Bb7 11. Rg6 Bf3 12. ef3 Bg7 13. Bd3 Kf8 14. Qe2 Kg8 15. Qf1 Kh7 16. Ne2 Qh8 17. Rg8 Rb8 18. Rg1 Rb4 19. Rb6 Re4 20. Rbb8 h1=B

The promoted rooks switch place


6 - Guus Rol
feenschach

1. c4 d5 2. c5 Kd7 3. Qa4 Ke6 4. Qa6 Ke5 5. d4 Kd4 6. a4 Ke5 7. Ra3 d4 8. Rf3 d3 9. e3 d2 9. Ke2 d1=R 10. Rf4 Rd6 11. Nd2 Ke6 13. Kd1 Kd7 14. c6 Ke8 15. Bb5 Rd7 16. cd7(=b)


7 - Markus Ott
feenschach 126, No. 7245

1. f3 h5 2. Kf2 Rh6 3. Ke3 Rc6 4. Kd3 Rc3 5. dc3 Nc6 6. Be3 Rb8 7. Ba7 b6 8. Kd2 Ba6 9. Ke1 Bd3 10. ed3 Rc8 11. d4 Ra8 12. Bd3 Nb8 13. Bh7 g6


8 - Sergei Tkachenko
feenschach 126, No. 7247

1. Nf3 Nc6 2. Nd4 Nd4 3. Na3 Nc2 4. Nc2 Nf6 5. Nd4 Ne4 6. Qa4 Nd2 7. Qd7 Kd7 8. Ne6 Ne4 9. Bh6 Ng5 10. OOO Ke8 11. Rd8


9 - Andrei Frolkin and Andrei Kornilov
feenschach

Nc1 must be a promoted knight, because unpromoting it unlocks the retro cage; the only other retraction Ne2-c1 gave an impossible retro-check. The capture balance (25 pieces in diagram, +2 (g+h line), +2 (exd, fxe for white), +1 (cxd->d1 for black or dxc->c8 for white), +2 (axb, bxc->c1=S for black) shows that the unpromotion must be c2-c1=N.

1. Qb2? isn't possible: -1. c2-c1=N Nd2-b1 -2. Kb1-a1 Nf3-d2 -3. Ka1-b1 Ng1-f3 -4. Kb1-a1 Ne2-g1 -5. Ka1-b1 Nc1-e2 -6. Bb1-a2 Na2-c1 -7. f3-f2 Qc1-a3 -8. h3-h2 a3xb4?? illegal capture balance.

Black has the move: 1. ... Ne2#!; retroplay is -1. .. Nd2-b1 -2. c2-c1=N Nf3-d2 -3. Kb1-a1 Ng1-f3 -4. Ka1-b1 Nh3-g1 -5. f3-f2 Nf2-h3 -6. Kb1-a1 Nd1-f2 -7. Kc1-b1 Nb2-d1 -8. Bb1-a2 Qa1-a3 -9. h3-h2 Ra(2,3)-a4 -10. Kd1-c1 Na4-b2 etc.


10 - Andrei Frolkin and Iwan Soraka
feenschach 130, No. 7515

1. Nc3 h5 2. Nd5 Rh6 3. Ne7 Rc6 4. Nc8 Bc5 5. Nd6 cd6 6. h3 Qa5 7. Rh2 Qa2 8. d3 a5 9. Kd2 a4 10. Kc3 Bf2 11. Kb4 Kf8 12. Kb5 Rc5 13. Kb6 Rc2 14. Kb7 Bc5 15. Kc8 Ne7