MESON Chess Problem Database

Problem Display
PID: 45370 (B1Q5/2p5/r1N1P3/2p5/2PbkPP1/4r1R1/2nPNpP1/2B2K2 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

B1Q5/2p5/r1N1P3/2p5/2PbkPP1/4r1R1/2nPNpP1/2B2K2

#2

13 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe2
      • 2.d3#
  • Tries
    • 1.Qe8?
      • threat
        • 2.Qg6#
      • 1...Rxe2
        • 2.d3#
      • 1...Kd3!
    • 1.Qg8?
      • threat
        • 2.Qh7#
        • 2.Qg6#
      • 1...Rxe2
        • 2.d3#
      • 1...Bg7
        • 2.Qh7#
      • 1...Kd3!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qh7#
      • 1...Kd3
        • 2.Se5#
      • 1...Rxe2
        • 2.d3#
      • 1...Bg7
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD,XS(D)::P(C)
  • Tries
    • Try
      • Q(M);
      • Threat
        • QAB(M)
      • Vars
        • R(c);N_GUARD,XS(D)::P(C)
      • Refutation
        • K(e);P_SPINR(c),S_FLIGHT
    • Try
      • Q(M);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);N_GUARD,XS(D)::P(C)
        • B(d);::QAB(M)
      • Refutation
        • K(e);P_SPINR(c),S_FLIGHT
  • Actual
    • Q(M);
    • Threat
      • QAB(M)
    • Vars
      • K(e);P_SPINB(d),P_SPINR(c),S_FLIGHT::S(J)
      • R(c);N_GUARD,XS(D)::P(C)
      • B(d);::QAB1(M)
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