MESON Chess Problem Database

Problem Display
PID: 247939 (4n1q1/6p1/8/8/B1p3b1/1Q1pP3/1PPB4/1K1k1NN1 w - - 0 1)

Surkov, Ruslan Albertovich

Uralski Problemist, 2006

4n1q1/6p1/8/8/B1p3b1/1Q1pP3/1PPB4/1K1k1NN1

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...dxc2+
      • 2.Qxc2#
  • Tries
    • 1.Qc3?
      • threat
        • 2.cxd3#
      • 1...dxc2+
        • 2.Bxc2#
        • 2.Qxc2#
      • 1...Bd7!
    • 1.Qb4?
      • threat
        • 2.cxd3#
        • 2.c3#
      • 1...dxc2+
        • 2.Bxc2#
      • 1...c3
        • 2.Qxg4#
      • 1...Bd7!
    • 1.Qb5?
      • threat
        • 2.cxd3#
        • 2.c3#
      • 1...dxc2+
        • 2.Bxc2#
      • 1...c3!
    • 1.Qb7?
      • threat
        • 2.cxd3#
        • 2.c3#
      • 1...dxc2+
        • 2.Bxc2#
      • 1...Bd7
        • 2.Qf3#
      • 1...c3!
  • Keys
    • 1.Qxd3!
      • threat
        • 2.c3#
      • 1...cxd3
        • 2.c4#
      • 1...Bd7
        • 2.Qe2#
      • 1...c3
        • 2.Bxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(b);CHECK,OGATE,P_SPINP(b),XP(E)::QAB1(G),XP(b)
  • Tries
    • Try
      • Q(G);
      • Threat
        • B(I)+P(E),XP(b)
      • Refutation
        • B(d);
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);CHECK,OGATE,P_SPINP(b),XP(E)::B(I),XP(b)
        • P(c);OGATE::QAB(G),XB(d)
      • Refutation
        • B(d);
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);CHECK,OGATE,P_SPINP(b),XP(E)::B(I),XP(b)
      • Refutation
        • P(c);
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);CHECK,OGATE,P_SPINP(b),XP(E)::B(I),XP(b)
        • B(d);N_GUARD::QAB(G)
      • Refutation
        • P(c);
  • Actual
    • Q(G);XP(b)
    • Threat
      • B(I)+P(E)
    • Vars
      • P(c);OGATE,XQ(G)::B(I)+P(E)
      • B(d);N_GUARD::QAB1(G)
      • P(c);N_GUARD::QAR(G)+B(F),XP(c)
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