MESON Chess Problem Database

Problem Display
PID: 133353 (2q1b3/4B3/3R2pK/ppN3rp/rkpP4/p6Q/B7/n3N3 w - - 0 1)

Pankratiev, Aleksandr Nikolaevich

2nd Prize, Szachy, 1988-1989

2q1b3/4B3/3R2pK/ppN3rp/rkpP4/p6Q/B7/n3N3

#2

8 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qg4
      • 2.Sa6#
    • 1...Qf5
      • 2.Sa6#
    • 1...Qa6
      • 2.Sxa6#
    • 1...Qe6
      • 2.Sa6#
    • 1...Qd7
      • 2.Sa6#
    • 1...Qc7
      • 2.Sa6#
    • 1...Qb8
      • 2.Sa6#
    • 1...Qd8
      • 2.Sa6#
    • 1...Sc2
      • 2.Sxc2#
    • 1...Sb3
      • 2.Sc2#
    • 1...c3
      • 2.Sed3#
      • 2.Scd3#
  • Tries
    • 1.Rd5?
      • threat
        • 2.Sa6#
      • 1...Qxh3
        • 2.Se4#
      • 1...Qxc5
        • 2.Bxc5#
      • 1...Qa6
        • 2.Sxa6#
      • 1...Rg3!
    • 1.Rc6?
      • threat
        • 2.Sa6#
      • 1...Rxc5
        • 2.Bxc5#
      • 1...Rg3
        • 2.Se4#
      • 1...Qa6
        • 2.Sxa6#
      • 1...Qxh3!
  • Keys
    • 1.Se4!
      • threat
        • 2.Qc3#
      • 1...Qxh3
        • 2.Rd5#
      • 1...Rg3
        • 2.Rc6#
      • 1...c3
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 10
  • Sets
    • Q(k);N_GUARD::S(E)
    • Q(k);N_GUARD::S(E),XQ(k)
    • S(a);N_GUARD::S(A),XS(a)
    • S(a);N_GUARD::S(A)
  • Tries
    • Try
      • R(F);
      • Threat
        • B(H)+S(E),DCHECK
      • Vars
        • Q(k);N_GUARD,XQ(C)::B(H)+S(E)
        • Q(k);OGATE,P_SPINQ(k),XS(E)::B(H),XQ(k)
        • Q(k);::B(H)+S(E),DCHECK,XQ(k)
      • Refutation
        • R(h);
    • Try
      • R(F);
      • Threat
        • B(H)+S(E),DCHECK
      • Vars
        • R(h);OGATE,P_SPINR(h),XS(E)::B(H),XR(h)
        • R(h);N_GUARD::B(H)+S(E)
        • Q(k);::B(H)+S(E),DCHECK,XQ(k)
      • Refutation
        • Q(k);XQ(C)
  • Actual
    • S(E);
    • Threat
      • QAB1(C)
    • Vars
      • Q(k);N_GUARD,XQ(C)::B(H)+R(F)
      • R(h);N_GUARD::B(H)+R(F)
      • P(e);N_GUARD::S(A)
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