MESON Chess Problem Database

Problem Display
PID: 45452 (8/4R3/2P1n3/N1P2b2/1BpkrN2/5PK1/3PQ3/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

8/4R3/2P1n3/N1P2b2/1BpkrN2/5PK1/3PQ3/8

#2

10 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Bc3#
    • 1...Re3
      • 2.Qxe3#
    • 1...Rxf4
      • 2.Rd7#
    • 1...Re5
      • 2.Qxc4#
    • 1...Bh3
      • 2.Qxe4#
    • 1...Bg4
      • 2.Qxe4#
    • 1...Sxf4
      • 2.Qxc4#
    • 1...Sxc5
      • 2.Bc3#
      • 2.Qxc4#
    • 1...Sg5
      • 2.Qxc4#
    • 1...Sc7
      • 2.Qxc4#
    • 1...Sg7
      • 2.Qxc4#
    • 1...Sd8
      • 2.Qxc4#
    • 1...Sf8
      • 2.Qxc4#
  • Tries
    • 1.Sb3+?
      • 1...Ke5
        • 2.Bc3#
      • 1...cxb3!
    • 1.Sb7?
      • threat
        • 2.Bc3#
      • 1...Ke5
        • 2.Bc3#
      • 1...Rxf4
        • 2.Rd7#
      • 1...Re3
        • 2.Qxe3#
      • 1...c3
        • 2.Bxc3#
      • 1...Sxf4!
    • 1.Qf2+?
      • 1...Re3
        • 2.Qxe3#
      • 1...Ke5!
    • 1.Qe3+?
      • 1...Ke5
        • 2.Bc3#
      • 1...Rxe3!
  • Keys
    • 1.c7!
      • threat
        • 2.Sc6#
      • 1...Ke5
        • 2.Bc3#
      • 1...Rxf4
        • 2.Rd7#
      • 1...Sxf4
        • 2.Qxc4#
      • 1...Sd8
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 8
  • Sets
    • K(b);P_SPINR(c),P_SPINS(e),S_FLIGHT::B(E)
    • R(c);N_GUARD,P_PINP(C)::QAB1(B),XR(c)
    • R(c);XS(F)::R(J)
    • R(c);SBLOCK::QAR1(B),XP(a)
    • B(d);N_GUARD::QAR1(B),XR(c)
    • S(e);XS(F)::QAR1(B),XP(a)
    • S(e);::QAR1(B),XP(a)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(b);P_SPINR(c),P_SPINS(e),S_FLIGHT::B(E)
      • Refutation
        • P(a);XS(G)
    • Try
      • S(G);
      • Threat
        • B(E)
      • Vars
        • K(b);P_SPINR(c),P_SPINS(e),S_FLIGHT::B(E)
        • R(c);XS(F)::R(J)
        • R(c);N_GUARD,P_PINP(C)::QAB1(B),XR(c)
        • P(a);::B(E),XP(a)
      • Refutation
        • S(e);XS(F)
    • Try
      • Q(B);CHECK
      • Vars
        • R(c);N_GUARD,P_PINP(C),P_SPINR(c)::QAB1(B),XR(c)
      • Refutation
        • K(b);P_SPINS(e),S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P_SPINR(c),P_SPINS(e),S_FLIGHT::B(E)
      • Refutation
        • R(c);P_PINP(C),XQ(B)
  • Actual
    • P(I);
    • Threat
      • S(G)
    • Vars
      • K(b);P_SPINR(c),P_SPINS(e),S_FLIGHT::B(E)
      • R(c);XS(F)::R(J)
      • S(e);XS(F)::QAR1(B),XP(a)
      • S(e);::QAR1(B),XP(a)
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Developed and maintained by Brian Stephenson.
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