MESON Chess Problem Database

Problem Display
PID: 80711 (8/2n1B3/b1pR4/Q2qk3/1p3NP1/3P2PK/1R6/2n2N2 w - - 0 1)

Spiess, Jean-Yves

2nd Prize, Liberte-Dimanche, 1988-1990

8/2n1B3/b1pR4/Q2qk3/1p3NP1/3P2PK/1R6/2n2N2

#2

10 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Bf6#
    • 1...Qxa5
      • 2.Sg6#
    • 1...Qb5
      • 2.Sg6#
    • 1...Qc5
      • 2.Sg6#
  • Tries
    • 1.Re2+?
      • 1...Kd4
        • 2.Bf6#
      • 1...Sxe2!
    • 1.Qc5?
      • threat
        • 2.Sg6#
        • 2.Bf6#
      • 1...Qxc5
        • 2.Sg6#
      • 1...Sxd3
        • 2.Re2#
      • 1...Se6
        • 2.Sg6#
        • 2.Rxe6#
      • 1...Se8
        • 2.Sg6#
        • 2.Re6#
      • 1...Bxd3!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Re2#
      • 1...Qh1+
        • 2.Rh2#
      • 1...Qg2+
        • 2.Rxg2#
      • 1...Kd4
        • 2.Rc2#
      • 1...Qd4
        • 2.Sg6#
      • 1...Se2
        • 2.Rxe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • K(d);S_FLIGHT::B(J)
    • Q(c);N_SPINQ(c),XQ(H)::S(F)
    • Q(c);::S(F)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(d);S_FLIGHT::B(J)
      • Refutation
        • S(a);XR(B)
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);N_SPINQ(c),XQ(H)::S(F)
        • S(a);N_GUARD,XP(C)::R(B)
      • Refutation
        • B(e);XP(C)
  • Actual
    • Q(H);N_PINQ(c)
    • Threat
      • QAB(H)+R(B),DCHECK
    • Vars
      • Q(c);CHECK,N_GUARD::QAB(H)+R(B)
      • Q(c);CHECK,N_GUARD::QAB(H)+R(B),XQ(c)
      • K(d);P_SPINQ(c),S_FLIGHT::QAB(H)+R(B)
      • Q(c);::S(F)
      • S(a);::QAB(H)+R(B),DCHECK,XS(a)
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