[Retros] shortest proofgames of castling switchback

[Hirokaz ONODA]

Hi,


The shortest PG for castling switchback:
against a promoted Rook
(7.5, 1) 1.e4 f5 2.Bc4 f4 3.Ne2 f3 4.0-0 fxe2 5.f3 e1=R 6.Kf2 Re3 7.Rh1 Rd3
8.Ke1 (Joost de Heer, 10/2/2005)

against an invading Queen to the 1st rank
(7.5, 5) 1.e3 d6 2.Bb5 Qd7 3.Ne2 Qxb5 4.0-0 Qxe2 5.f3 Qxd1 6.Kf2 Qxc1 7.Rh1
Qe1 8.Kxe1 (Andrew Buchanan, 11/2/2005)
 
against an invading Knight to the 1st rank
(8.5, 2) 1.g3 f5 2.Bh3 f4 3.Bxd7 Nxd7 4.Nh3 Ne5 5.O-O Nf3 6.Kg2 e5 7.Rh1
Ng1 8.Kf1 f3 9. Ke1 (Ayako Okaya, Problem Paradise 13 1999)

against a promoted Queen
(9.0, 3) [8.5, 3] 1. e4 f5 2. Bd3 f4 3. Ne2 f3 4. 0-0 fxe2 5. f4 e1=Q 6.
Qe2 Qxd2 7. Kf2 Qa5 8. Rh1 Qxa2 9. Ke1 Qf7 (Markus Ott, Themes-64 1981)

against an invading King to the 1st rank
(15.0, 5) 1. d4 d6 2. Kd2 Qd7 3. Ke3 Qh3+ 4. Kf4 g5+ 5. Kxg5 e5 6. d5 Be6
7. dxe6 Ne7 8. Qd5 f6+ 9. Kxf6 Bh6 10. Nd2 0-0+ 11. Kxe7 Rxf2 12. Kd8 Kf8
13. Kc8 Ke8 14. Rb1 Rf8 15. Ngf3 Rh8 (Hirokaz Onada, The Problemist 1991)

against an invading Bishop to the 1st rank: (vacant)

against an invading Rook to the 1st rank: (vacant)

against a promoted Knight: (vacant)

against a promoted Bishop: (vacant)

without any invader to the 1st rank
(14.0, 4) [13.5, 4] 1. Nf3 b5 2. Nd4 Bb7 3. Nxb5 Bf3 4. gxf3 f6 5. Bh3 Kf7
6.  Be6+ Kg6 7. Bxg8 e6 8. 0-0 Bd6 9. Kg2 Bxh2 10. Nd6 Qe7 11.  Nb7 d6 12.
Rh1 Nd7 13. Kf1 Rf8 14. Ke1 Qd8 (Gianni Donati, U.S. Problem Bulletin
105/106 01-04/1997)

Captureless: 
(20.5, 0) [19.5, 0] 1. g3 a5 2. Bg2 Ra6 3. Be4 Rf6 4. Nf3 d6 5. 0-0 Qd7 6.
Kh1 Qh3 7. Rg1 Qf1 8. b3 Bh3 9. Ba3 Rf5 10. Qc1 f6 11. Qb2 Kf7 12. Qd4 Kg6
13. Nc3 Qb1 14. Bc1 Kh5 15. Rg2 g6 16. Kg1 Bh6 17. Kf1 Bg5 18. Ke1 Nh6 19.
Rg1 Re8 20. Rh1 Ng8 21. Ng1 (Noam D. Elkies, 17/7/2007)

Q-side castling switchback:
(15.5, 2) 1. d3 d5 2. Be3 d4 3. Nd2 dxe3 4. Nb3 Qd4 5. Qd2 Bd7 6. 0-0-0
exd2+ 7. Kb1 Qe3 8. Rc1 d1=R 9. d4 Rd3 10. Rd1 Rc3 11. Rd2 Rc6 12. Kc1 Rd6
13. Kd1 Bc6 14. Ke1 Nd7 15. Rd1 0-0-0 16. Ra1 (Andrey Frolkin, diagrammes
94 07-09/1990)

cf.(after O-O-O, K returns, but R does not):
1.d4 c5 2.Bh6 cxd4 3.Qxd4 Nxh6 4.Nd2 Nf5 5.0-0-0 Nxd4 6.Re1 Nxc2 7.Kd1 Nxe1
8.Kxe1 (Christoph Fieberg, 2005)

Double castling switchback:
(19.0, 3) 1. e4 c5 2. Bd3 c4 3. Ne2 cxd3 4. 0-0 dxe2 5. c4 e1=R 6. c5 Re3
7. c6 Rf3 8. c7 Rf4 9. f3 e5 10. Kf2 Bc5+ 11. Ke1 Ne7 12. Rh1 0-0 13.
cxd8=R Nec6 14. Re8 Nd8 15. Re6 Nbc6 16. Rg6 f6 17. Rg3 Kf7 18. Qb3+ Ke8
19. Qd5 Rh8 (Andrey Frolkin, Die Schwalbe 124 08/1990)
 

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