MESON Chess Problem Database

Problem Display
PID: 180320 (2B2R2/5pP1/3PNb2/1R2pk1P/3p1Bp1/3P2p1/6P1/2K5 w - - 0 1)

Lider, Valentin Viktorovich

Europe Echecs, 1979

2B2R2/5pP1/3PNb2/1R2pk1P/3p1Bp1/3P2p1/6P1/2K5

#2

11 + 7

6490 yacpdb 2018
3713 Snap 2022

SOLUTION

  • SOUND
  • Tries
    • 1.g8Q?
      • threat
        • 2.Qh7#
      • 1...fxe6
        • 2.Qg5#
      • 1...Bh4
        • 2.Qg6#
      • 1...Bg5
        • 2.Qxg5#
        • 2.Qg6#
      • 1...Be7
        • 2.Qg6#
      • 1...Bd8
        • 2.Qg6#
      • 1...Bh8
        • 2.Qg5#
        • 2.Qg6#
      • 1...Bg7!
  • Keys
    • 1.Bxe5!
      • 1...Bg5+
        • 2.Sf4#
      • 1...Bxe5
        • 2.Rxf7#
      • 1...Bxg7
        • 2.Bxg7#
      • 1...fxe6
        • 2.Bxg3#
      • 1...Bh4
        • 2.Bxd4#
      • 1...Be7
        • 2.Bxd4#
      • 1...Bd8
        • 2.Bxd4#

This anticipates 267911(1980)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • P(I);
      • Threat
        • QAB(I)
      • Vars
        • P(g);P_SPINB(f),XS(H)::QAR1(I)
        • B(f);S_CUTP(g)::QAB1(I)
      • Refutation
        • B(f);
  • Actual
    • B(D);XP(d)
    • Vars
      • B(f);CHECK,P_SPINP(g),SBLOCK::B(J)+S(H)
      • B(f);OGATEB,P_SPINB(f),P_SPINP(g),XB(D)::R(K),XP(g)
      • B(f);OGATE,P_SPINP(g),XP(I)::R(E)+B(D),XB(f)
      • P(g);P_SPINB(f),P_SPINP(g),XS(H)::R(E)+B(D),XP(a)
      • B(f);N_GUARD,P_SPINP(g)::R(E)+B(D),XP(b)
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