MESON Chess Problem Database

Problem Display
PID: 109696 (6Q1/3p4/2p1NKp1/2Pknb1R/4N1p1/2RP4/6B1/b4r2 w - - 0 1)

White, Alain Campbell

Pittsburgh Gazette-Times, 1918

6Q1/3p4/2p1NKp1/2Pknb1R/4N1p1/2RP4/6B1/b4r2

#2

9 + 9

56 The Problemist 1937
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc3
      • 2.Sxc3#
    • 1...Sxd3
      • 2.Sf2#
    • 1...Sc4
      • 2.Sf2#
      • 2.dxc4#
    • 1...Sf7
      • 2.Sf2#
  • Tries
    • 1.Sf2+?
      • 1...Be4
        • 2.Bxe4#
        • 2.Rxe5#
        • 2.dxe4#
      • 1...Sf3!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Sc3#
        • 2.Sf4#
        • 2.Sc7#
      • 1...Bxe4+
        • 2.Sf4#
      • 1...Bxe6+
        • 2.Sf2#
      • 1...Sxd3+
        • 2.Sd4#
      • 1...Sf3+
        • 2.Sd4#
      • 1...Sxc4+
        • 2.Sc3#
      • 1...Sf7+
        • 2.Sc3#
      • 1...dxe6
        • 2.Sc3#
      • 1...Rf3
        • 2.Sf4#
        • 2.Sc7#
      • 1...Rf4
        • 2.Sc3#
        • 2.Sxf4#
        • 2.Sc7#
      • 1...Bc3
        • 2.Sxc3#
        • 2.Sf4#
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • B(a);XR(B)::B(A)+S(D),DCHECK,XB(a)
    • S(e);N_GUARD,P_PINR(B),P_SPINB(f),XP(C)::B(A)+S(D)
    • S(e);N_GUARD,P_PINR(B),P_SPINB(f)::B(A)+S(D)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • S(e);P_PINR(B),P_SPINB(f),P_SPINS(e)
  • Actual
    • R(B);
    • Threat
      • DUALS(3)
    • Vars
      • B(f);CHECK,P_SPINB(f),P_SPINS(e),XS(D)::QAB(I)+S(G),DCHECK
      • B(f);CHECK,N_GUARD,P_SPINB(f),P_SPINS(e),XS(G)::B(A)+S(D)
      • S(e);CHECK,N_GUARD,P_SPINB(f),XP(C)::QAB(I)+S(G)
      • S(e);CHECK,N_GUARD,P_SPINB(f)::QAB(I)+S(G)
      • S(e);CHECK,P_SPINB(f),XR(B)::B(A)+S(D),DCHECK
      • S(e);CHECK,P_SPINB(f)::B(A)+S(D),DCHECK
      • P(i);P_SPINP(i),XS(G)::B(A)+S(D),DCHECK
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