MESON Chess Problem Database

Problem Display
PID: 70040 (QqNR4/1P1P4/1PkP4/8/2K5/8/8/8 w - - 0 1)

Harley, Brian

The Observer, 1944

(First published on Tue Oct 24 1944)

QqNR4/1P1P4/1PkP4/8/2K5/8/8/8

#2

8 + 2

56 The Problemist 2006
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd6
      • 2.b8Q#
      • 2.b8S#
      • 2.b8B#
      • 2.b8R#
    • 1...Qa7
      • 2.b8S#
    • 1...Qc7
      • 2.b8S#
    • 1...Qxb7
      • 2.Qa4#
    • 1...Qxa8
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Qxc8
      • 2.bxc8S#
  • Keys
    • 1.Qa6!
      • 1...Qxd6
        • 2.Sa7#
      • 1...Qxb7
        • 2.Qb5#
        • 2.Qa4#
      • 1...Qxc8
        • 2.dxc8Q#
        • 2.dxc8R#
      • 1...Qa7
        • 2.bxa7#
      • 1...Qc7
        • 2.bxc7#
      • 1...Qa8
        • 2.bxa8Q#
        • 2.bxa8B#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(b);OGATE::P=S
    • Q(b);P_SPINQ(b),SBLOCK,XP(D)::QAB(F)
    • Q(b);OGATE,XQ(F)::PXQ(b)=Q
    • Q(b);OGATE,XS(G)::PXQ(b)=S
  • Actual
    • Q(F);
    • Vars
      • Q(b);N_GUARD,SBLOCK,XP(C)::S(G)
      • Q(b);OGATE,XS(G)::PXQ(b)=Q
      • Q(b);OGATE::QAR(F)+P(B),XQ(b)
      • Q(b);OGATE::PXQ(b)=Q
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