MESON Chess Problem Database

Problem Display
PID: 213153 (8/8/8/1Q6/8/2P5/k1NK4/qN6 w - - 0 1)

Kirillov, Stanislav Vasilovich

Suomen Shakki, 1994

8/8/8/1Q6/8/2P5/k1NK4/qN6

#2

5 + 2

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc3+
      • 2.Sxc3#
  • Tries
    • 1.Qa4+?
      • 1...Kxb1
        • 2.Qxa1#
      • 1...Kb2!
    • 1.Qb4?
      • 1...Qxc3+
        • 2.Sxc3#
      • 1...Qxb1
        • 2.Qa3#
      • 1...Qb2!
  • Keys
    • 1.Kc1!
      • threat
        • 2.Qa4#
        • 2.Qc4#
        • 2.Qd5#
      • 1...Qb2+
        • 2.Qxb2#
      • 1...Qxb1+
        • 2.Qxb1#
      • 1...Qxc3
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(a);CHECK,XP(D)::S(A),XQ(a)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT,XS(A)::QAR1(E),XQ(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(E);
      • Vars
        • Q(a);CHECK,XP(D)::S(A),XQ(a)
        • Q(a);SBLOCK,XS(A)::QAR1(E)
      • Refutation
        • Q(a);P_PINS(B)
  • Actual
    • K(C);P_SPINS(A),S_FLIGHT
    • Threat
      • DUALS(3)
    • Vars
      • Q(a);CHECK,N_GUARD,N_PINS(A)::QAR1(E),XQ(a)
      • Q(a);CHECK,OGATE,XS(A)::QAB1(E),XQ(a)
      • Q(a);N_PINS(A),P_PINS(B),XP(D)::S(A),XQ(a)
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