MESON Chess Problem Database

Problem Display
PID: 139659 (7b/8/1Q6/8/p7/k7/1N2n3/K7 w - - 0 1)

Davis, Edward

Kipping, Cyril Stanley

The Problemist, 1937

7b/8/1Q6/8/p7/k7/1N2n3/K7

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Bxb2+
      • 2.Qxb2#
    • 1...Sc3
      • 2.Sc4#
    • 1...Sd4
      • 2.Sc4#
  • Tries
    • 1.Kb1?
      • threat
        • 2.Sc4#
      • 1...Bxb2
        • 2.Qxb2#
      • 1...Sc3+!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qxa4#
      • 1...Bxb2+
        • 2.Qxb2#
      • 1...Sc3
        • 2.Sc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • B(d);CHECK,OGATE,XS(B)::QAB1(C),XB(d)
    • S(a);N_PINS(B)::S(B)
  • Tries
    • Try
      • K(A);N_SPINS(B),P-FLIGHT
      • Threat
        • S(B)
      • Vars
        • B(d);OGATE,XS(B)::QAB1(C),XB(d)
      • Refutation
        • S(a);CHECK
  • Actual
    • Q(C);
    • Threat
      • QAR1(C),XP(c)
    • Vars
      • B(d);CHECK,OGATE,XS(B)::QAB1(C),XB(d)
      • S(a);N_PINS(B)::S(B)
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