MESON Chess Problem Database

Problem Display
PID: 15532 (2n1b3/2K2B2/1R2P3/2Nk2p1/5p1R/2p1Q3/8/8 w - - 0 1)

Popov, Valery

1/2 Prize, Magadansky Komsomolets, 1985

2n1b3/2K2B2/1R2P3/2Nk2p1/5p1R/2p1Q3/8/8

#2

7 + 6

721 Variantim 1990

SOLUTION

  • SOUND
  • Sets
    • 1...Ba4
      • 2.e7#
    • 1...Bb5
      • 2.e7#
    • 1...Bc6
      • 2.e7#
    • 1...Bd7
      • 2.exd7#
    • 1...f3
      • 2.Qd4#
      • 2.Qxg5#
  • Tries
    • 1.Sb3?
      • threat
        • 2.Qd4#
      • 1...Kc4
        • 2.Qd4#
        • 2.Qe4#
      • 1...fxe3!
    • 1.Rb5?
      • threat
        • 2.Qe4#
      • 1...Kc4
        • 2.Qd3#
      • 1...Bxb5
        • 2.e7#
      • 1...fxe3
        • 2.Sd7#
      • 1...Sd6!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Qd3#
      • 1...Kc4
        • 2.Qe4#
      • 1...Bxd7
        • 2.exd7#
      • 1...fxe3
        • 2.Rb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(f);N_GUARD::B(G)+P(E)
    • B(f);OGATE::B(G)+P(E),XB(f)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAR1(A)
      • Refutation
        • P(b);XQ(A)
    • Try
      • R(D);
      • Threat
        • QAB1(A)
      • Vars
        • K(c);P_SPINP(b),S_FLIGHT::QAB1(A)
        • B(f);N_GUARD,XR(D)::B(G)+P(E)
        • P(b);XQ(A)::R(D)+S(C)
      • Refutation
        • S(e);
  • Actual
    • S(C);
    • Threat
      • QAR2(A)
    • Vars
      • K(c);P_SPINP(b),S_FLIGHT::QAR2(A)
      • B(f);OGATE,XS(C)::B(G)+P(E),XB(f)
      • P(b);XQ(A)::R(D)
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