MESON Chess Problem Database

Problem Display
PID: 45349 (K3R1b1/7Q/1N4B1/1R1pbn2/p2k4/1P1p1p2/p2B4/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

K3R1b1/7Q/1N4B1/1R1pbn2/p2k4/1P1p1p2/p2B4/8

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qh4#
  • Tries
    • 1.Rxd5+?
      • 1...Ke4
        • 2.Bxf5#
        • 2.Rexe5#
        • 2.Qh4#
      • 1...Bxd5+!
    • 1.Qh4+?
      • 1...Bf4
        • 2.Qxf4#
      • 1...Sxh4!
    • 1.Qc7?
      • threat
        • 2.Rb4#
        • 2.Qxe5#
      • 1...Ke4
        • 2.Qxe5#
      • 1...Bh2
        • 2.Bc3#
        • 2.Rb4#
        • 2.Qc3#
        • 2.Qc5#
      • 1...Bg3
        • 2.Bc3#
        • 2.Rb4#
        • 2.Qc3#
        • 2.Qc5#
      • 1...Bf4
        • 2.Bc3#
        • 2.Rb4#
        • 2.Qxf4#
        • 2.Qc3#
        • 2.Qc5#
      • 1...Bd6
        • 2.Bc3#
        • 2.Qc3#
      • 1...Bf6
        • 2.Bc3#
        • 2.Rb4#
        • 2.Qf4#
        • 2.Qc3#
        • 2.Qc5#
      • 1...Bg7
        • 2.Bc3#
        • 2.Rb4#
        • 2.Qf4#
        • 2.Qc3#
        • 2.Qc5#
      • 1...Bh8
        • 2.Bc3#
        • 2.Rb4#
        • 2.Qf4#
        • 2.Qc3#
        • 2.Qc5#
      • 1...Be6
        • 2.Rb4#
      • 1...Se3
        • 2.Bc3#
        • 2.Qxe5#
        • 2.Qc3#
        • 2.Qc5#
      • 1...Sd6
        • 2.Qc3#
        • 2.Qc5#
      • 1...Se7
        • 2.Rb4#
        • 2.Qc3#
        • 2.Qc5#
      • 1...Bxc7!
  • Keys
    • 1.Sxa4!
      • threat
        • 2.Rb4#
      • 1...Ke4
        • 2.Qh4#
      • 1...Bd6
        • 2.Bc3#
      • 1...Se3
        • 2.Bc3#
        • 2.Qa7#
      • 1...Sd6
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(e);P-FLIGHT,P_SPINB(g),P_SPINS(h)::QAR(F)
  • Tries
    • Try
      • R(C);CHECK,XP(f)
      • Refutation
        • B(i);CHECK,XR(C)
    • Try
      • Q(F);CHECK
      • Vars
        • B(g);N_GUARD,P_SPINB(g)::QAR2(F),XB(g)
      • Refutation
        • S(h);XQ(F)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • K(e);P-FLIGHT,P_SPINB(g),P_SPINS(h)::QAR1(F),XB(g)
        • B(i);::R(C)
      • Refutation
        • B(g);XQ(F)
  • Actual
    • S(D);XP(d)
    • Threat
      • R(C)
    • Vars
      • K(e);P-FLIGHT,P_SPINB(g),P_SPINS(h)::QAR(F)
      • B(g);::B(A)
      • S(h);::QAB(F)
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