Kurt Keller (Германия)  
#6 3+4

1. Qa6+?, Qc6/Qd7? [2. Qa4#]
1. ... Kb4!

1. Kd1/Ke1? d2 2. Kxd2 d3 3. Qb6 Kd4 4. Qe6 c4 5. Qd5#
1. ... Kc3!

1. Kc1! Kc3 (1. ... d2+? 2. Kxd2 d3 3. Qb6 Kd4 4. Qe6 c4 5. Qd5#)
2. Qb2+ Kc4 3. Kd1 d2 4. Kxd2 d3 5. Qb7 Kd4 6. Qd5#

Keywords:
Miniature, stalemate dissolution, flight giving key, White correction, pure round trip (K), switchback (K,KQk)