MESON Chess Problem Database

Problem Display
PID: 45365 (2r5/1p5p/bp1RQB1K/3Nb1p1/PPkPn2R/8/2P5/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

2r5/1p5p/bp1RQB1K/3Nb1p1/PPkPn2R/8/2P5/8

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Qxc8#
    • 1...Sf2
      • 2.Qxc8#
    • 1...Sc3
      • 2.Qxc8#
    • 1...Sg3
      • 2.Qxc8#
    • 1...Sxf6
      • 2.Qxc8#
  • Tries
    • 1.Rxe4?
      • threat
        • 2.Qxc8#
        • 2.dxe5#
      • 1...Bxd4
        • 2.Rxd4#
        • 2.Qxc8#
      • 1...Bxf6
        • 2.Qxc8#
      • 1...Rc5
        • 2.dxe5#
      • 1...Rc6
        • 2.dxe5#
      • 1...Rc7
        • 2.dxe5#
      • 1...Ra8
        • 2.dxe5#
      • 1...Rb8
        • 2.dxe5#
      • 1...Rd8
        • 2.dxe5#
      • 1...Re8
        • 2.dxe5#
      • 1...Rf8
        • 2.dxe5#
      • 1...Rg8
        • 2.dxe5#
      • 1...Rh8
        • 2.dxe5#
      • 1...Bh2
        • 2.Qxc8#
      • 1...Bg3
        • 2.Qxc8#
      • 1...Bf4
        • 2.Qxc8#
      • 1...Bb5
        • 2.dxe5#
      • 1...Bxd6!
    • 1.Qxc8+?
      • 1...Kxd4
        • 2.Qc3#
      • 1...Sc5!
  • Keys
    • 1.Qh3!
      • threat
        • 2.Qd3#
      • 1...Kxd4
        • 2.Sxb6#
      • 1...Bxd6
        • 2.Qb3#
      • 1...Sxd6
        • 2.Qb3#
      • 1...Bg3
        • 2.Qf1#
      • 1...Sf2
        • 2.Qxc8#
        • 2.Qb3#
        • 2.Qc3#
      • 1...Sg3
        • 2.Qxc8#
      • 1...Sc5
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • S(b);N_GUARD::QAR(H),XR(i)
    • S(b);N_GUARD,XB(I)::QAR(H),XR(i)
  • Tries
    • Try
      • R(E);XS(b)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);XB(I)::QAR(H),XR(i)
        • R(i);::R(E)+P(D),XB(c)
        • B(c);::QAR(H),XR(i)
        • B(e);::R(E)+P(D),XB(c)
      • Refutation
        • B(c);XR(G)
    • Try
      • Q(H);CHECK,XR(i)
      • Vars
        • K(a);OGATE,P-FLIGHT,P_SPINB(c),P_SPINS(b),XP(D)::QAB1(H)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • Q(H);
    • Threat
      • QAB1(H)
    • Vars
      • K(a);P-FLIGHT,P_SPINB(c),P_SPINS(b),XP(D)::R(G)+S(F),XP(f)
      • B(c);XR(G)::QAB1(H)
      • S(b);XR(G)::QAB1(H)
      • B(c);::QAB(H)
      • S(b);N_GUARD::QAR(H),XR(i)
      • S(b);N_GUARD::QAR1(H)
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