MESON Chess Problem Database

Problem Display
PID: 9626 (4K3/8/4BQ2/7k/7P/5n2/8/7r w - - 0 1)

Zalkind, Lazar Borissovich

Deutsche Schachzeitung, 1907

4K3/8/4BQ2/7k/7P/5n2/8/7r

#2

4 + 3

2838 Fun with Chess Miniatures 1996
5454 Near Snap 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Qg5#
    • 1...Sg1
      • 2.Qg5#
    • 1...Sd2
      • 2.Qg5#
    • 1...Sh2
      • 2.Qg5#
    • 1...Sd4
      • 2.Qg5#
    • 1...Se5
      • 2.Qg5#
    • 1...Sg5
      • 2.Qxg5#
  • Tries
    • 1.Qf5+?
      • 1...Kxh4
        • 2.Qg4#
      • 1...Sg5
        • 2.Qxg5#
      • 1...Kh6!
    • 1.Qg6+?
      • 1...Kxh4
        • 2.Qg4#
      • 1...Kxg6!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qh7#
      • 1...Kxh4
        • 2.Qg4#
      • 1...Rxh4
        • 2.Bf7#
      • 1...Sxh4
        • 2.Bg4#
      • 1...Sg5
        • 2.Qxg5#

This anticipates 157550(1930), 157645(2015)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • S(b);N_GUARD::QAR1(C)
    • S(b);N_GUARD::QAR1(C),XS(b)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(A)::QAR1(C)
        • S(b);N_GUARD,P_SPINS(b)::QAR1(C),XS(b)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(A)::QAR1(C)
      • Refutation
        • K(c);S_FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR2(C)
    • Vars
      • K(c);P-FLIGHT,XP(A)::QAR1(C)
      • R(a);SBLOCK,XP(A)::B(B)
      • S(b);SBLOCK,XP(A)::B(B)
      • S(b);N_GUARD::QAR1(C),XS(b)
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