MESON Chess Problem Database

Problem Display
PID: 238051 (2N5/4ppB1/1p2pP2/1P2kPR1/2Pp4/1p5N/1Q2P3/1K5B w - - 0 1)

Bogdanov, Evgeny Mikhailovich

64 Shakhmatnoe obozrenie, 1986

2N5/4ppB1/1p2pP2/1P2kPR1/2Pp4/1p5N/1Q2P3/1K5B

#2

12 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Bf8?
      • 1...Kxf6
        • 2.Bg7#
      • 1...exf6
        • 2.Bd6#
      • 1...exf5!
    • 1.Rg3?
      • 1...Kxf5
        • 2.Rg5#
      • 1...exf5
        • 2.Re3#
      • 1...exf6!
    • 1.Qc2?
      • threat
        • 2.Qe4#
      • 1...d3
        • 2.Qb2#
        • 2.Qc3#
      • 1...bxc2+!
    • 1.Qxb3?
      • threat
        • 2.Qg3#
      • 1...d3
        • 2.Qb2#
        • 2.Qc3#
      • 1...exf5!
  • Keys
    • 1.Qa3!
      • 1...exf5
        • 2.Qxe7#
      • 1...exf6
        • 2.Qd6#
      • 1...d3
        • 2.Qb2#
      • 1...b2
        • 2.Qg3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(K);
      • Vars
        • K(c);OGATEB,S_FLIGHT,XP(J)::B(K)
        • P(f);OGATE,SBLOCK,XP(J)::B(K)
      • Refutation
        • P(e);XP(H)
    • Try
      • R(I);
      • Vars
        • K(c);N_SPINP(b),OGATEB,P-FLIGHT,XP(H)::R1(I)
        • P(e);SBLOCK,XP(H)::R(I)
      • Refutation
        • P(f);XP(J)
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • QAR1(C)
      • Refutation
        • P(a);CHECK,XQ(C)
    • Try
      • Q(C);N_PINP(b),XP(a)
      • Threat
        • QAB(C)
      • Refutation
        • P(e);P_SPINP(e),XP(H)
  • Actual
    • Q(C);N_PINP(b)
    • Vars
      • P(e);OGATEB,P_SPINP(e),XP(H)::QAR2(C),XP(f)
      • P(f);N_GUARD,P_SPINP(f),XP(J)::QAB1(C)
      • P(b);OGATEB::QAB(C)
      • P(a);OGATE::QAB(C)
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