MESON Chess Problem Database

Problem Display
PID: 11044 (4K3/6p1/4pR2/5bPQ/2BpkP2/3Npp2/8/8 w - - 0 1)

Ellison, Wallace D

Chess, 1936

4K3/6p1/4pR2/5bPQ/2BpkP2/3Npp2/8/8

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bh3
      • 2.Sc5#
    • 1...Bg4
      • 2.Sc5#
    • 1...Bg6+
      • 2.Qxg6#
    • 1...Bh7
      • 2.Sc5#
    • 1...f2
      • 2.Qh1#
  • Tries
    • 1.Qf7?
      • threat
        • 2.Qb7#
      • 1...Bg6
        • 2.Sc5#
        • 2.Rxe6#
        • 2.Qxg6#
      • 1...e2!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Rxe6#
      • 1...Bg6+
        • 2.Qxg6#
      • 1...Bxh7
        • 2.Sc5#
      • 1...gxf6
        • 2.Qb7#
      • 1...f2
        • 2.Qh1#
      • 1...e5
        • 2.Qxf5#
      • 1...g6
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(e);::S(A)
    • B(e);CHECK,OGATEB::QAB(E),XB(e)
    • P(b);OGATEB::QAB(E)
  • Tries
    • Try
      • Q(E);
      • Threat
        • QAB(E)
      • Refutation
        • P(a);
  • Actual
    • Q(E);P_PINB(e)
    • Threat
      • R(F),XP(f)
    • Vars
      • B(e);CHECK,OGATEB::QAB(E),XB(e)
      • B(e);N_SPINB(e),XQ(E)::S(A)
      • P(g);OGATE,XR(F)::QAB(E)
      • P(b);OGATEB::QAB(E)
      • P(f);N_GUARD::QAB1(E),XB(e)
      • P(g);N_SPINB(e),OGATE::QAB(E)
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