MESON Chess Problem Database

Problem Display
PID: 175474 (5K2/1Q1p4/4kp2/6p1/8/3P4/5R2/8 w - - 0 1)

Meisling, Otto Simon

Philadelphia Times, 1899

5K2/1Q1p4/4kp2/6p1/8/3P4/5R2/8

#2

4 + 4

6490 yacpdb 2018
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.Qe7#
  • Tries
    • 1.Re2+?
      • 1...Kf5
        • 2.Qe4#
      • 1...Kd6!
    • 1.Qxd7+?
      • 1...Ke5
        • 2.Rf5#
      • 1...Kxd7!
  • Keys
    • 1.Rf5!
      • threat
        • 2.Qd5#
      • 1...Kxf5
        • 2.Qe4#
      • 1...Kd6
        • 2.Qb6#
      • 1...d5
        • 2.Qxd5#
      • 1...d6
        • 2.Qc8#

This anticipates 233321(1985), 183339(2018)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(d);OGATE,SBLOCK::QAR1(C)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);CHECK,XP(d)
      • Vars
        • K(b);P-FLIGHT::R1(A)
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
  • Actual
    • R(A);
    • Threat
      • QAB1(C)
    • Vars
      • K(b);S_FLIGHT,XR(A)::QAB1(C)
      • K(b);P-FLIGHT::QAR2(C)
      • P(d);::QAB1(C),XP(d)
      • P(d);OGATEB,SBLOCK::QAB(C)
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