Retro Problems from Issue 20
415 - Paul Raican Quartz, No. 20, 04-06/2002 (This problem was later found to be cooked)
10+14. Proof game in 12.5 moves (Transmuting Kings)
[rnb1k1nr/ppp1p1pp/8/8/1q2pK2/4PP2/PPPB2P1/6NR]
416 - Rene Jean Millour Quartz, No. 20, 04-06/2002
4+4. In the shortest proof game, where and by which pieces have the missing pieces been captured? (Monochrome chess)
[5K2/4p1b1/5p2/8/B5P1/8/4P3/7k]
417 - Leonid N. Borodatow Quartz, No. 20, 04-06/2002
12+15. #2
[rnqbrNB1/pbppk2p/P1pp3N/5KpP/3P2QB/4PRP1/4p3/8]
418 - Leonid N. Borodatow Quartz, No. 20, 04-06/2002
14+11. Release the position
[3b2bq/2pPnpnr/2Qp1K1B/3pP1R1/4Nk2/1P3P1P/2P1PP2/4N3]