MESON Chess Problem Database

Problem Display
PID: 45544 (8/3K1p1B/8/p1Nk1rp1/2Rn4/N7/4PP2/4Q3 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

8/3K1p1B/8/p1Nk1rp1/2Rn4/N7/4PP2/4Q3

#2

8 + 6

SOLUTION

  • SOUND
  • Tries
    • 1.Qd2?
      • threat
        • 2.Qxd4#
      • 1...Ke5
        • 2.Qxd4#
      • 1...Rf4!
    • 1.Qd1?
      • threat
        • 2.Qxd4#
      • 1...Ke5
        • 2.Qxd4#
      • 1...Rf4!
  • Keys
    • 1.Sd3!
      • threat
        • 2.e4#
      • 1...Ke4
        • 2.Qh1#
      • 1...Sxe2
        • 2.Qxa5#
      • 1...Rf4
        • 2.Rc5#
      • 1...Re5
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);P_PINS(a)
      • Threat
        • QAR1(A),XS(a)
      • Vars
        • K(c);N_SPINS(a),P-FLIGHT::QAB1(A),XS(a)
      • Refutation
        • R(d);
    • Try
      • Q(A);P_PINS(a)
      • Threat
        • QAR1(A),XS(a)
      • Vars
        • K(c);N_SPINS(a),P-FLIGHT::QAB1(A),XS(a)
      • Refutation
        • R(d);
  • Actual
    • S(F);
    • Threat
      • P(B)
    • Vars
      • K(c);P_SPINR(d),P_SPINS(a),S_FLIGHT::QAB(A)
      • S(a);N_GUARD,XP(B)::QAR(A),XP(b)
      • R(d);::R1(E)
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