1977-1979
664 - André Hazebrouck 1st Prize Schachmaty w SSSR 1978
12+11. Mate in 1 (who?)
665 - Werner Keym Die Schwalbe, 197
2+11. Last move?
666 - Aleksandr Kislyak feenschach, 1979
14+11. Shortest proof game
667 - Wolfgang Dittmann feenschach, 1979
4+10. Proca-retractor. Wh. retracts 22 moves and mates in 1
668 - Boris Ostruh and Marko Klasinc 3rd Prize Die Schwalbe, 1977
10+14. Proca-retractor. Wh. retracts 2400 moves and mates in 1
669 - Wolfgang Dittmann 1st Prize O-O 1979
2+7. Proca-retractor. Wh. retracts 4 moves and castles forward
670 - Andrei Frolkin 1st Prize Die Schwalbe 1979
13+9. How many wh. Knights are promotees?
671 - M. Caillaud 2nd Prize feenschach 1979
12+10. (Maos g1, e7) Both sides may castle. The game was played with Maos instead of Knights. (a) Where have the Bishops been captured? (b) Least number of moves by Mao b8?
672 - A. Klibanski and N. Plaksin 2nd Prize feenschach 1977
13+10. (Grid-Chess) (a) Where have the missing men been captured? (b) First move of the Black King?
673 - Boris Ostruh and Marko Klasinc 1st Prize feenschach, 1977
7+9. Wh. & Bl. retract 5 moves each so that we can determine the 1st move of a largest number of Rooks