MESON Chess Problem Database

Problem Display
PID: 71763 (QbN5/1n6/1PkPB3/1p6/3P4/8/K7/8 w - - 0 1)

Levman, Semyon Semyonovich

Izvestia, 1923

QbN5/1n6/1PkPB3/1p6/3P4/8/K7/8

#2

7 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...b4
      • 2.Qa4#
  • Tries
    • 1.d7?
      • threat
        • 2.d8S#
      • 1...b4
        • 2.Qa4#
      • 1...Bc7!
  • Keys
    • 1.Qa6!
      • 1...Bxd6
        • 2.Sa7#
      • 1...Sxd6
        • 2.Se7#
      • 1...Ba7
        • 2.bxa7#
      • 1...Bc7
        • 2.bxc7#
      • 1...Sa5
        • 2.b7#
      • 1...Sc5
        • 2.d5#
      • 1...Sd8
        • 2.b7#
      • 1...b4
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::QAB(F)
  • Tries
    • Try
      • P(D);
      • Threat
        • P=S
      • Vars
        • P(a);OGATEB::QAB(F)
      • Refutation
        • B(d);
  • Actual
    • Q(F);N_PINS(c)
    • Vars
      • B(d);N_GUARD,SBLOCK,XP(D)::S(G)
      • S(c);SBLOCK,XP(D)::S(G)
      • B(d);OGATE::QAR(F)+P(C),XB(d)
      • S(c);OGATE::QAR(F)+P(C)
      • S(c);SBLOCK::P(B)
      • P(a);OGATEB::QAB(F)
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