MESON Chess Problem Database

Problem Display
PID: 51533 (8/2p5/n2p4/1P1k1K2/p1RN1nR1/3Bp1bp/4P3/3Q4 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

The Guardian, 1963

8/2p5/n2p4/1P1k1K2/p1RN1nR1/3Bp1bp/4P3/3Q4

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sxe2
      • 2.Qh1#
    • 1...Sh5
      • 2.Qh1#
    • 1...Se6
      • 2.Qh1#
    • 1...Sg6
      • 2.Qh1#
  • Tries
    • 1.Sc2?
      • threat
        • 2.Sxe3#
      • 1...Sg2
        • 2.Rgd4#
      • 1...Bf2!
    • 1.Sc6?
      • threat
        • 2.Se7#
      • 1...Sg6
        • 2.Bb1#
        • 2.Bc2#
        • 2.Rgd4#
        • 2.Qh1#
      • 1...Bh4!
    • 1.Se6?
      • threat
        • 2.Rd4#
      • 1...Sxe2
        • 2.Bxe2#
        • 2.Qh1#
      • 1...Sxe6
        • 2.Qh1#
      • 1...c5!
    • 1.Rc2?
      • threat
        • 2.Be4#
      • 1...Sxd3
        • 2.Qh1#
      • 1...Sc5
        • 2.Bc4#
      • 1...Kxd4!
    • 1.Rc3?
      • threat
        • 2.Be4#
      • 1...Sxd3
        • 2.Qh1#
      • 1...Sc5
        • 2.Bc4#
      • 1...Kxd4!
    • 1.Rc6?
      • threat
        • 2.Bc4#
        • 2.Be4#
      • 1...Kxd4
        • 2.Bb1#
        • 2.Bc2#
      • 1...Sxd3
        • 2.Qh1#
      • 1...Sc5!
  • Keys
    • 1.Rc1!
      • threat
        • 2.Be4#
      • 1...Kxd4
        • 2.Bb1#
      • 1...Sxd3
        • 2.Qh1#
      • 1...Sc5
        • 2.Bc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • S(e);N_GUARD,XP(B)::QAB(A)
    • S(e);N_GUARD::QAB(A)
  • Tries
    • Try
      • S(E);
      • Threat
        • S(E),XP(a)
      • Vars
        • S(e);OGATE::R1(F)
      • Refutation
        • B(b);
    • Try
      • S(E);
      • Threat
        • S(E)
      • Refutation
        • B(b);
    • Try
      • S(E);
      • Threat
        • R1(D)
      • Vars
        • S(e);N_GUARD,XS(E)::QAB(A)
      • Refutation
        • P(i);
    • Try
      • R(D);
      • Threat
        • B(C)
      • Vars
        • S(e);N_GUARD,XB(C)::QAB(A)
        • S(g);SBLOCK::B(C)
      • Refutation
        • K(f);P-FLIGHT,P_SPINS(e),XS(E)
    • Try
      • R(D);
      • Threat
        • B(C)
      • Vars
        • S(e);N_GUARD,XB(C)::QAB(A)
        • S(g);SBLOCK::B(C)
      • Refutation
        • K(f);P-FLIGHT,P_SPINS(e),XS(E)
    • Try
      • R(D);
      • Threat
        • DUALS(2)
      • Vars
        • S(e);N_GUARD,XB(C)::QAB(A)
      • Refutation
        • S(g);
  • Actual
    • R(D);
    • Threat
      • B(C)
    • Vars
      • K(f);OGATEB,P-FLIGHT,P_SPINS(e),XS(E)::QAR(A)+B(C)
      • S(e);N_GUARD,XB(C)::QAB(A)
      • S(g);SBLOCK::B(C)
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