MESON Chess Problem Database

Problem Display
PID: 275457 (B1q1Qb1n/2ppBp2/1n6/p3kN2/2pN3R/K2p4/5R2/7b w - - 0 1)

Hersom, Donald H

British Chess Magazine, 1935

B1q1Qb1n/2ppBp2/1n6/p3kN2/2pN3R/K2p4/5R2/7b

#2

8 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Rxe4#
    • 1...Bh6
      • 2.Bd8#
    • 1...Bxe7+
      • 2.Qxe7#
    • 1...Bg7
      • 2.Bd8#
    • 1...f6
      • 2.Bd6#
  • Tries
    • 1.Sd6?
      • threat
        • 2.Rf5#
      • 1...Bxe7
        • 2.Qxe7#
      • 1...Be4
        • 2.Rxe4#
      • 1...f5
        • 2.Rxf5#
      • 1...Bf3!
    • 1.Re2+?
      • 1...Be4
        • 2.Rexe4#
        • 2.Rhxe4#
      • 1...dxe2!
  • Keys
    • 1.Sg7!
      • threat
        • 2.Rf5#
      • 1...Bxe7+
        • 2.Qxe7#
      • 1...Be4
        • 2.Rxe4#
      • 1...Bf3
        • 2.Sxf3#
      • 1...d5
        • 2.Sc6#
      • 1...d6
        • 2.Bf6#
      • 1...f5
        • 2.Rxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD::R1(D),XB(a)
    • B(k);N_PINB(F)::QAR(H)+B(F)
    • B(k);CHECK,OGATE,P_SPINB(k),XB(F)::QAR2(H),XB(k)
    • P(i);SBLOCK::QAR(H)+B(F),DCHECK
  • Tries
    • Try
      • S(E);N_SPINB(F)
      • Threat
        • R1(A)
      • Vars
        • B(k);OGATE,P_PINS(E),P_SPINB(k),XB(F)::QAR2(H),XB(k)
        • B(a);N_GUARD::R1(D),XB(a)
        • P(i);::R1(A),XP(i)
      • Refutation
        • B(a);
    • Try
      • R(A);CHECK
      • Refutation
        • P(b);XR(A)
  • Actual
    • S(E);
    • Threat
      • R1(A)
    • Vars
      • B(k);CHECK,OGATE,P_SPINB(k),XB(F)::QAR2(H),XB(k)
      • B(a);N_GUARD::R1(D),XB(a)
      • B(a);N_GUARD::S(C),XB(a)
      • P(h);N_GUARD,SBLOCK,S_CUTB(a)::S(C)
      • P(h);N_PINB(F),SBLOCK::QAR(H)+B(F),DCHECK
      • P(i);::R1(A),XP(i)
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