MESON Chess Problem Database

Problem Display
PID: 24374 (8/5K2/5B2/5k2/5p2/5Q2/5n2/8 w - - 0 1)

Rosenthal, Moisej Schlemowitsch

Freie Presse, 1967

8/5K2/5B2/5k2/5p2/5Q2/5n2/8

#2

3 + 3

3295 Einfuhrung in die Welt des Schachproblem 1984
3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991
136 Problem Observer 2012
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Se4
      • 2.Qh3#
    • 1...Sg4
      • 2.Qd3#
  • Tries
    • 1.Qe2?
      • threat
        • 2.Qe6#
      • 1...f3
        • 2.Qxf3#
      • 1...Se4!
    • 1.Qc6?
      • threat
        • 2.Qe6#
      • 1...f3
        • 2.Qxf3#
      • 1...Kg4!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Qg6#
      • 1...f3
        • 2.Qxf3#
      • 1...Sg4
        • 2.Qc2#

This anticipates 171295(1987)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD,SBLOCK::QAB(A)
  • Tries
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • QAB1(A)
      • Vars
        • P(b);OGATEB::QAR2(A),XP(b)
      • Refutation
        • S(a);
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • QAB1(A)
      • Vars
        • P(b);OGATEB::QAR2(A),XP(b)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(A);N_PINP(b)
    • Threat
      • QAB1(A)
    • Vars
      • P(b);OGATEB::QAR2(A),XP(b)
      • S(a);OGATE,SBLOCK::QAB(A)
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