MESON Chess Problem Database

Problem Display
PID: 205539 (2B5/8/5p2/1K1kpQ2/3p4/8/8/8 w - - 0 1)

Schonberger, Tibor

L'Echiquier Marseillais, 1925

2B5/8/5p2/1K1kpQ2/3p4/8/8/8

#2

3 + 4

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qd7#
    • 1...d3
      • 2.Qxd3#
  • Tries
    • 1.Kb6?
      • 1...Kd6
        • 2.Qe6#
        • 2.Qd7#
      • 1...d3
        • 2.Qxd3#
      • 1...Kc4!
    • 1.Bd7?
      • 1...d3
        • 2.Qxd3#
      • 1...Kd6!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qc6#
      • 1...Kd6
        • 2.Qc5#
      • 1...d3
        • 2.Qxd3#
      • 1...e4
        • 2.Qc5#

This anticipates 241772(1928), 171353(1995)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINP(c),P-FLIGHT::QAR1(B)
    • P(a);OGATEB::QAR2(B),XP(a)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(a);OGATEB::QAR2(B),XP(a)
      • Refutation
        • K(b);N_SPINP(c),S_FLIGHT
    • Try
      • B(C);
      • Vars
        • P(a);OGATEB::QAR2(B),XP(a)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
  • Actual
    • Q(B);N_PINP(c)
    • Threat
      • QAB1(B)
    • Vars
      • K(b);P-FLIGHT::QAB1(B)
      • P(a);OGATEB::QAR2(B),XP(a)
      • P(c);SBLOCK::QAR1(B)
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