MESON Chess Problem Database

Problem Display
PID: 23281 (1nq5/1N2B3/3R4/1pN4r/1kp1P3/1p5Q/8/R3K3 w Q - 0 1)

Yarmonov, Igor Petrovich

The Problemist, 1997

1nq5/1N2B3/3R4/1pN4r/1kp1P3/1p5Q/8/R3K3

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sa6
      • 2.Sxa6#
    • 1...Sc6
      • 2.Sa6#
    • 1...Sd7
      • 2.Sa6#
    • 1...b2
      • 2.Qa3#
    • 1...c3
      • 2.Rd4#
  • Tries
    • 1.Sd3+?
      • 1...Kc3
        • 2.Rc1#
      • 1...cxd3!
    • 1.Rd5?
      • threat
        • 2.Sa6#
      • 1...Qxh3
        • 2.Sa4#
      • 1...Qxc5
        • 2.Bxc5#
      • 1...c3
        • 2.Rd4#
      • 1...Sa6
        • 2.Sxa6#
      • 1...Rxh3!
    • 1.Rc6?
      • threat
        • 2.Sa6#
      • 1...Rxh3
        • 2.Sa4#
      • 1...Rxc5
        • 2.Bxc5#
      • 1...Sa6
        • 2.Sxa6#
      • 1...Qxh3!
  • Keys
    • 1.Sa4!
      • threat
        • 2.Qc3#
      • 1...Qxh3
        • 2.Rd5#
      • 1...Rxh3
        • 2.Rc6#
      • 1...bxa4
        • 2.Rb6#
      • 1...c3
        • 2.Rd4#
      • 1...Qh8
        • 2.Rd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • S(f);N_GUARD::S(E),XS(f)
    • S(f);N_GUARD::S(E)
    • P(a);OGATE::QAB1(C)
    • P(c);OGATEB::R(F)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(b);S_FLIGHT::R(A)
      • Refutation
        • P(c);XS(E)
    • Try
      • R(F);
      • Threat
        • B(H)+S(E),DCHECK
      • Vars
        • Q(g);N_GUARD,XQ(C)::B(H)+S(E)
        • Q(g);OGATE,P_SPINQ(g),XS(E)::B(H),XQ(g)
        • P(c);OGATEB::R(F)
        • S(f);::B(H)+S(E),DCHECK,XS(f)
      • Refutation
        • R(e);XQ(C)
    • Try
      • R(F);
      • Threat
        • B(H)+S(E),DCHECK
      • Vars
        • R(e);N_GUARD,XQ(C)::B(H)+S(E)
        • R(e);OGATE,P_SPINR(e),XS(E)::B(H),XR(e)
        • S(f);::B(H)+S(E),DCHECK,XS(f)
      • Refutation
        • Q(g);XQ(C)
  • Actual
    • S(E);
    • Threat
      • QAB1(C)
    • Vars
      • Q(g);N_GUARD,XQ(C)::B(H)+R(F)
      • R(e);N_GUARD,XQ(C)::B(H)+R(F)
      • P(d);XS(E)::B(H)+R(F),DCHECK
      • P(c);::B(H)+R(F),DCHECK
      • Q(g);N_GUARD::B(H)+R(F)
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