MESON Chess Problem Database

Problem Display
PID: 45345 (B3R3/4B1p1/6Qn/2Rb1n2/1N1k2N1/3p1p2/8/K7 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

B3R3/4B1p1/6Qn/2Rb1n2/1N1k2N1/3p1p2/8/K7

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Rc4#
    • 1...Se3
      • 2.Qxd3#
    • 1...Sg3
      • 2.Qxd3#
    • 1...Sh4
      • 2.Qxd3#
  • Tries
    • 1.Sc2+?
      • 1...Ke4
        • 2.Bg5#
        • 2.Bd6#
        • 2.Rc4#
      • 1...dxc2!
    • 1.Rc2?
      • threat
        • 2.Bc5#
      • 1...Ke4
        • 2.Rc4#
      • 1...Sxe7
        • 2.Qxd3#
      • 1...Bc4
        • 2.Qb6#
      • 1...Sd6
        • 2.Qxd3#
      • 1...dxc2!
    • 1.Qf6+?
      • 1...Ke4
        • 2.Qe5#
      • 1...gxf6!
    • 1.Qxg7+?
      • 1...Ke4
        • 2.Qe5#
      • 1...Sxg7!
  • Keys
    • 1.Rc1!
      • threat
        • 2.Bc5#
      • 1...Ke4
        • 2.Rc4#
      • 1...Sxe7
        • 2.Qxd3#
      • 1...Bc4
        • 2.Qb6#
      • 1...Sd6
        • 2.Qxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • K(c);P-FLIGHT,P_SPINB(d),P_SPINS(e)::R(D)
    • S(e);OGATE::QAR1(E),XP(a)
  • Tries
    • Try
      • S(B);CHECK
      • Refutation
        • P(a);XS(B)
    • Try
      • R(D);
      • Threat
        • B(F)
      • Vars
        • K(c);P-FLIGHT,P_SPINB(d),P_SPINS(e)::R(D)
        • S(e);OGATE,XB(F)::QAR1(E),XP(a)
        • B(d);::QAB(E)
        • S(e);OGATE::QAR1(E),XP(a)
      • Refutation
        • P(a);XR(D)
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINB(d)::QAR1(E)
      • Refutation
        • P(g);XQ(E)
    • Try
      • Q(E);CHECK,XP(g)
      • Vars
        • K(c);P-FLIGHT,P_SPINB(d)::QAR1(E)
      • Refutation
        • S(e);XQ(E)
  • Actual
    • R(D);
    • Threat
      • B(F)
    • Vars
      • K(c);P-FLIGHT,P_SPINB(d),P_SPINS(e)::R(D)
      • S(e);OGATE,XB(F)::QAR1(E),XP(a)
      • B(d);::QAB(E)
      • S(e);OGATE::QAR1(E),XP(a)
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