MESON Chess Problem Database

Problem Display
PID: 135576 (5KNb/1R5p/P3N1kp/3p3p/1r1r1p1P/1p5B/1Bb1RP2/q1Q5 w - - 0 1)

Lincoln, Robert A

Comm., SSA 025. TT, 2008

5KNb/1R5p/P3N1kp/3p3p/1r1r1p1P/1p5B/1Bb1RP2/q1Q5

#2

11 + 12

145 StrateGems 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb2
      • 2.Qg1#
    • 1...Qa2
      • 2.Qg1#
    • 1...Qa3
      • 2.Qg1#
    • 1...Qa4
      • 2.Qg1#
    • 1...Qa5
      • 2.Qg1#
    • 1...Qxa6
      • 2.Qg1#
    • 1...Rd1
      • 2.Se7#
    • 1...Rd2
      • 2.Se7#
    • 1...Rd3
      • 2.Se7#
    • 1...Rc4
      • 2.Se7#
    • 1...Re4
      • 2.Se7#
    • 1...Bb1
      • 2.Qg1#
    • 1...Be4
      • 2.Sxf4#
    • 1...Bg7+
      • 2.Rxg7#
    • 1...f3
      • 2.Qxh6#
  • Tries
    • 1.Qxf4?
      • threat
        • 2.Se7#
        • 2.Qxh6#
        • 2.Qf7#
      • 1...Bg7+
        • 2.Rxg7#
      • 1...Rxb7
        • 2.Qxh6#
      • 1...Qc1
        • 2.Se7#
        • 2.Qf7#
      • 1...Bf5
        • 2.Bxf5#
        • 2.Qxh6#
        • 2.Qxf5#
      • 1...Bf6
        • 2.Qxh6#
        • 2.Qxf6#
      • 1...Rxf4+!
    • 1.Qxc2+?
      • 1...Rd3
        • 2.Se7#
      • 1...Re4
        • 2.Sxf4#
        • 2.Se7#
      • 1...bxc2!
  • Keys
    • 1.Sg7!
      • threat
        • 2.Re6#
      • 1...Bxg7+
        • 2.Rxg7#
      • 1...Qxa6
        • 2.Qg1#
      • 1...Rb6
        • 2.Rxb6#
      • 1...Re4
        • 2.Bf5#
      • 1...Be4
        • 2.Qc6#
      • 1...Bf5
        • 2.Bxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 11
  • Sets
    • Q(a);N_GUARD,XB(B)::QAR(A)
    • Q(a);N_GUARD::QAR(A)
    • Q(a);N_GUARD,XP(G)::QAR(A)
    • R(e);::S(K)
    • B(b);S_CUTQ(a)::QAR(A)
    • B(b);S_CUTR(e)::S(H),XP(f)
    • B(l);CHECK,N_GUARD::R1(I),XB(l)
    • P(f);OGATE::QAR1(A),XP(j)
  • Tries
    • Try
      • Q(A);XP(f)
      • Threat
        • DUALS(3)
      • Vars
        • B(l);CHECK,N_GUARD::R1(I),XB(l)
        • R(d);XR(I)::QAR1(A),XP(j)
      • Refutation
        • R(e);CHECK,XQ(A)
    • Try
      • Q(A);CHECK,XB(b)
      • Vars
        • R(e);P_SPINR(e)::S(K)
      • Refutation
        • P(c);XQ(A)
  • Actual
    • S(H);
    • Threat
      • R(C)
    • Vars
      • B(l);CHECK,OGATE,XS(H)::R1(I),XB(l)
      • Q(a);N_GUARD,XP(G)::QAR(A)
      • R(d);N_GUARD::R(I),XR(d)
      • R(e);S_CUTB(b)::B(E)
      • B(b);OGATE::QAR(A)
      • B(b);N_GUARD::B(E),XB(b)
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