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Retro Problems from Issue 20

377 - Leonid N. Borodatow
Quartz 19, Jan-Mar 2002

[5B1k/4pRnN/4nRQK/5ppp/P6p/6p1/6P1/8]

8+9. Retract 37 moves, then #1 (Proca retractor)

[5B1k/4pRnN/4nRQK/5ppp/P6p/6p1/6P1/8]


378 - Paul Raican
Quartz 19, Jan-Mar 2002

[8/3p2pP/3B4/8/8/8/8/8]

2+2. Add a wK, wR, wN, wP, sK for an Illegal Cluster (2 solutions)

[8/3p2pP/3B4/8/8/8/8/8]