MESON Chess Problem Database

Problem Display
PID: 1131 (3BBQqr/3p1n1N/3rR1pp/2p1p2k/2KpRP2/5p1P/7n/8 w - - 0 1)

McWilliam, Robert C

Problem Observer, 1975

3BBQqr/3p1n1N/3rR1pp/2p1p2k/2KpRP2/5p1P/7n/8

#2

9 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...g5
      • 2.Qxh6#
  • Tries
    • 1.Qxf7?
      • threat
        • 2.R4xe5#
        • 2.R6xe5#
        • 2.Qf5#
      • 1...Qxe8
        • 2.R4xe5#
      • 1...Rxe6
        • 2.Qf5#
      • 1...exf4
        • 2.R4e5#
        • 2.R6e5#
        • 2.Qf5#
      • 1...dxe6
        • 2.Rxe5#
      • 1...Qg7
        • 2.Qf5#
      • 1...Qf8
        • 2.R4xe5#
        • 2.R6xe5#
        • 2.Qxg6#
      • 1...Rd5
        • 2.Qf5#
      • 1...Sg4
        • 2.Qf5#
      • 1...Qxf7!
    • 1.f5?
      • threat
        • 2.Rh4#
      • 1...Sg4
        • 2.hxg4#
      • 1...Sg5
        • 2.Sf6#
      • 1...g5
        • 2.Sf6#
        • 2.Qxh6#
      • 1...Sxd8!
  • Keys
    • 1.fxe5!
      • threat
        • 2.Rh4#
      • 1...Sxe5+
        • 2.Rxe5#
      • 1...Sxd8
        • 2.Qf5#
      • 1...Sg4
        • 2.hxg4#
      • 1...Sg5
        • 2.Sf6#
      • 1...g5
        • 2.Qxh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(h);P_SPINS(k)::QAR1(I),XP(i)
  • Tries
    • Try
      • Q(I);P_PINP(h),XS(k)
      • Threat
        • DUALS(3)
      • Vars
        • Q(l);XB(H)::R(C),XP(e)
        • R(g);XR(E)::QAR2(I)
        • P(j);XR(E)::R(C),XP(e)
        • Q(l);::QAR2(I)
        • R(g);::QAR2(I)
        • S(a);::QAR2(I)
      • Refutation
        • Q(l);N_SPINP(h),P_PINR(E),XQ(I)
    • Try
      • P(D);
      • Threat
        • R1(C)
      • Vars
        • S(a);OGATE::P(A),XS(a)
        • S(k);P_PINR(E),P_SPINP(h),SBLOCK::S(F)
      • Refutation
        • S(k);P_PINR(E),P_SPINP(h),XB(G)
  • Actual
    • P(D);XP(e)
    • Threat
      • R1(C)
    • Vars
      • S(k);CHECK,OGATE,P_PINR(E),P_SPINP(h),XP(D)::R(C),XS(k)
      • S(k);OGATE,P_PINR(E),P_SPINP(h),XB(G)::QAR2(I)
      • S(a);OGATE::P(A),XS(a)
      • S(k);P_PINR(E),P_SPINP(h),SBLOCK::S(F)
      • P(h);P_SPINS(k)::QAR1(I),XP(i)
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