MESON Chess Problem Database

Problem Display
PID: 45213 (8/Q1pR4/N6B/p2r4/B1P1r2R/2kP4/8/K1N1b3 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

8/Q1pR4/N6B/p2r4/B1P1r2R/2kP4/8/K1N1b3

#2

10 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc4
      • 2.Rxc4#
    • 1...Rb5
      • 2.Sa2#
    • 1...Rc5
      • 2.Sa2#
    • 1...Re5
      • 2.Sa2#
    • 1...Rf5
      • 2.Sa2#
    • 1...Rh5
      • 2.Sa2#
  • Tries
    • 1.Qe3?
      • threat
        • 2.Sa2#
        • 2.Se2#
      • 1...Rxd3
        • 2.Qxd3#
      • 1...Rxe3!
    • 1.Qb6?
      • threat
        • 2.Qb2#
      • 1...Rxd3
        • 2.Qb3#
      • 1...Re2
        • 2.Qb3#
      • 1...Rb5
        • 2.Sa2#
      • 1...cxb6!
    • 1.Qb7?
      • threat
        • 2.Qb2#
      • 1...Rxd3
        • 2.Qb3#
      • 1...Re2
        • 2.Qb3#
      • 1...Rb5
        • 2.Sa2#
      • 1...Kd4!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Qb2#
      • 1...Kd4
        • 2.Qh8#
      • 1...Rxd3
        • 2.Qb3#
      • 1...Re2
        • 2.Qb3#
      • 1...Rb5
        • 2.Sa2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • R(c);OGATE,XP(E)::R1(F),XR(c)
    • R(e);::S(B)
  • Tries
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • R(e);OGATE,P_SPINR(e),XP(C)::QAR1(I),XR(e)
      • Refutation
        • R(c);XQ(I)
    • Try
      • Q(I);
      • Threat
        • QAB1(I)
      • Vars
        • R(e);XP(C)::QAR1(I)
        • R(c);::QAR1(I)
        • R(e);::S(B)
      • Refutation
        • P(f);XQ(I)
    • Try
      • Q(I);
      • Threat
        • QAB1(I)
      • Vars
        • R(e);XP(C)::QAR1(I)
        • R(c);::QAR1(I)
        • R(e);::S(B)
      • Refutation
        • K(b);P_SPINR(c),S_FLIGHT
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • K(b);P_SPINR(c),S_FLIGHT::QAB(I)
      • R(e);XP(C)::QAR1(I)
      • R(c);::QAR1(I)
      • R(e);::S(B)
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