The Retrograde Analysis Corner
No. 90, Apr. 1998 - SOLUTIONS
7379 - Henrik Juel
Add wKg7, bKe8, bQg8. But completely anticipated by Jörg Varnholt, Problemkiste Oct. 1997.
7380 - Mario Velucchi
Only one of the castlings is legal, since white's last move must've been with one of the rooks. So, depending on which castling is still legal, the solution is 1. Nb1 OO 2. Nc3 Rfb1 3. Na2 Ra2#, or 1. Nc4 OOO 2. Ka3 Kc2 3. Ka2 Ra1#.
7381 - Olli Heimo
1. h4 b5 2. h5 b4 3. h6 b3 4. hg7 bc2 5. gh8=Q cb1=Q 6. Qd4 Qc1 7. Qa7 Qc6 8. Qc7 Qg2 9. Qc8 Qg1 10. Qc5 Qg6 11. Qh5
1. c4 g5 2. c5 g4 3. c6 g3 4. cb7 gh2 5. bc8=Q hg1=Q 6. Qc7 Qg2 7. Qa7 Qc6 8. Qd5 Qc1 9. Qh8 Qb1 10. Qe5 Qg6 11. Qh5