MESON Chess Problem Database

Problem Display
PID: 44836 (8/4p3/3np1K1/QPpkPn1R/6pr/1N4N1/2P1B3/2B1R2b w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

8/4p3/3np1K1/QPpkPn1R/6pr/1N4N1/2P1B3/2B1R2b

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.Qd2#
    • 1...Sh6
      • 2.Rd1#
      • 2.Qd2#
    • 1...Sg7
      • 2.Rd1#
      • 2.Qd2#
  • Tries
    • 1.Bc4+?
      • 1...Sxc4
        • 2.Qa8#
      • 1...Kxc4!
    • 1.Rd1+?
      • 1...Kxe5
        • 2.Qc3#
        • 2.Qa1#
      • 1...Sd4!
    • 1.Qd2+?
      • 1...Kxe5
        • 2.Bb2#
      • 1...Sd4!
    • 1.Qc3?
      • threat
        • 2.Qxc5#
      • 1...Sxg3
        • 2.Qd3#
      • 1...Sc4
        • 2.Bxc4#
      • 1...Se4
        • 2.Bc4#
      • 1...Sb7
        • 2.Bc4#
      • 1...c4!
    • 1.c4+?
      • 1...Kxe5
        • 2.Qc3#
        • 2.Qa1#
      • 1...Sxc4!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qxc5#
      • 1...Kxe5
        • 2.Bf3#
      • 1...Sxg3
        • 2.Qc6#
      • 1...Se4
        • 2.c4#
      • 1...Sb7
        • 2.c4#
      • 1...c4
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • S(f);N_GUARD::QAR(G)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • S(g);SBLOCK,XB(D)::QAB(G)
      • Refutation
        • K(e);S_FLIGHT,XB(D)
    • Try
      • R(B);CHECK
      • Refutation
        • S(f);P_SPINS(f)
    • Try
      • Q(G);CHECK
      • Vars
        • K(e);P-FLIGHT,P_SPINS(f),XP(I)::B(A)
      • Refutation
        • S(f);P_SPINS(f)
    • Try
      • Q(G);
      • Threat
        • QAR1(G),XP(d)
      • Vars
        • S(f);N_GUARD,XS(F)::QAR2(G)
        • S(g);N_GUARD::B(D),XS(g)
        • S(g);N_GUARD::B(D)
      • Refutation
        • P(d);
    • Try
      • P(C);CHECK
      • Refutation
        • S(g);XP(C)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G),XP(d)
    • Vars
      • K(e);P-FLIGHT,P_SPINS(f),XP(I)::R(B)+B(D)
      • S(f);XS(F)::QAB1(G)
      • S(g);N_GUARD::P(C)
      • P(d);::QAR1(G)
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Developed and maintained by Brian Stephenson.
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