MESON Chess Problem Database

Problem Display
PID: 1138 (8/N3BK2/P5P1/RB1k1p1Q/P2P1q2/1p2p1N1/4P1r1/2nR4 w - - 0 1)

McWilliam, Robert C

Problem Observer, 1981

8/N3BK2/P5P1/RB1k1p1Q/P2P1q2/1p2p1N1/4P1r1/2nR4

#2

13 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qg5
      • 2.Qf3#
    • 1...Qd6
      • 2.Qf3#
    • 1...Qh6
      • 2.Qf3#
      • 2.Qxf5#
    • 1...Qc7
      • 2.Qf3#
    • 1...Qb8
      • 2.Qf3#
    • 1...Qf3
      • 2.Qxf3#
    • 1...Qxd4
      • 2.Qxf5#
    • 1...Qh4
      • 2.Qxf5#
    • 1...Rxe2
      • 2.Bxe2#
    • 1...Sxe2
      • 2.Bxe2#
  • Tries
    • 1.Qxf5+?
      • 1...Qe5
        • 2.Qxe5#
      • 1...Qxf5+!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Bd3#
      • 1...Qxf5+
        • 2.Qxf5#
      • 1...Ke4
        • 2.Bc6#
      • 1...Qxd4
        • 2.Sg3#
      • 1...Qd6
        • 2.Qf3#
      • 1...Qc7
        • 2.Qf3#
      • 1...Qb8
        • 2.Qf3#
      • 1...Sd3
        • 2.Bxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(e);N_GUARD,N_SPINP(g)::QAB(H)
    • Q(e);N_GUARD::QAB(H)
    • Q(e);N_GUARD,P_PINB(L)::QAB(H)
    • Q(e);N_GUARD::QAB(H),XQ(e)
    • Q(e);N_GUARD,P_SPINQ(e),XP(E)::QAR2(H),XP(g)
    • Q(e);N_GUARD::QAR2(H),XP(g)
    • R(b);OGATE,XP(B)::R(F)+B(G),XR(b)
    • S(a);OGATE,XP(B)::R(F)+B(G),XS(a)
  • Tries
    • Try
      • Q(H);CHECK,P_SPINQ(H),XP(g)
      • Vars
        • Q(e);N_PINQ(H),P_SPINQ(e)::QAR1(H),XQ(e)
      • Refutation
        • Q(e);CHECK,XQ(H)
  • Actual
    • S(C);P_SPINS(C),XP(g)
    • Threat
      • R(F)+B(G)
    • Vars
      • Q(e);CHECK,OGATE,P_SPINQ(e),XS(C)::QAR2(H),XQ(e)
      • K(f);S_FLIGHT::B(G)
      • Q(e);N_PINS(C),P_SPINQ(e),XP(E)::QAR(H)+S(C)
      • Q(e);N_GUARD,N_PINS(C)::QAB(H)
      • Q(e);N_GUARD,N_PINS(C),P_PINB(L)::QAB(H)
      • S(a);::R(F)+B(G),XS(a)
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