MESON Chess Problem Database

Problem Display
PID: 52073 (1Q6/p4nr1/B1PP2p1/2Rp4/1P1k1p2/5PN1/P7/1nK1R3 w - - 0 1)

Fedyakov, Sergey

Vasilenko, Anatoly Grigorovich

1st Prize, Sahs/Shakhmaty (Riga), 1989

1Q6/p4nr1/B1PP2p1/2Rp4/1P1k1p2/5PN1/P7/1nK1R3

#2

11 + 8

4827 FIDE Album (1989-1991) 1997

SOLUTION

  • SOUND
  • Sets
    • 1...g5
      • 2.Sf5#
  • Tries
    • 1.Rxd5+?
      • 1...Kc3
        • 2.Se2#
        • 2.Se4#
        • 2.Rd3#
      • 1...Kxd5!
    • 1.Qxa7?
      • threat
        • 2.Rc2#
      • 1...Sxd6
        • 2.Qxg7#
      • 1...Sc3
        • 2.Ra5#
      • 1...Sg5
        • 2.Qxg7#
      • 1...Sh6
        • 2.Qxg7#
      • 1...Sd8
        • 2.Qxg7#
      • 1...Sh8
        • 2.Qxg7#
      • 1...Se5!
    • 1.Qe8?
      • threat
        • 2.Se2#
      • 1...fxg3
        • 2.Qe3#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sc3!
  • Keys
    • 1.Rc3!
      • threat
        • 2.Rd3#
      • 1...Kxc3
        • 2.Se2#
      • 1...Sxc3
        • 2.Qxa7#
      • 1...Se5
        • 2.Se2#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(e);N_GUARD::S(E)
  • Tries
    • Try
      • R(G);CHECK,XP(d)
      • Refutation
        • K(b);P-FLIGHT,XR(G)
    • Try
      • Q(K);XP(f)
      • Threat
        • QAB(K)+R(G)
      • Vars
        • S(g);OGATE,XP(J)::QAB(K),XR(h)
        • S(a);SBLOCK::QAB(K)+R(G)
        • S(g);OGATE::QAB(K),XR(h)
      • Refutation
        • S(g);
    • Try
      • Q(K);
      • Threat
        • S(E)
      • Vars
        • P(c);N_GUARD,XS(E)::QAB1(K)
        • S(g);N_GUARD::QAB1(K),XS(g)
      • Refutation
        • S(a);
  • Actual
    • R(G);
    • Threat
      • R1(G)
    • Vars
      • K(b);S_FLIGHT,XR(G)::S(E)
      • S(a);SBLOCK,XR(G)::QAB(K),XP(f)
      • S(g);SBLOCK::S(E)
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