MESON Chess Problem Database

Problem Display
PID: 110805 (8/2N5/6p1/1Q6/3pk1K1/4p3/8/8 w - - 0 1)

Jakab, Arpad

Uj Nemezdek, 1922

8/2N5/6p1/1Q6/3pk1K1/4p3/8/8

#2

3 + 4

3713 Snap 2009
6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...e2
      • 2.Qxe2#
    • 1...d3
      • 2.Qd5#
    • 1...g5
      • 2.Qf5#
  • Tries
    • 1.Kg5?
      • 1...e2
        • 2.Qxe2#
      • 1...d3
        • 2.Qd5#
      • 1...Kf3!
    • 1.Qc4?
      • 1...Ke5
        • 2.Qe6#
      • 1...e2
        • 2.Qxe2#
      • 1...g5!
    • 1.Qc6+?
      • 1...Ke5
        • 2.Qe6#
      • 1...Kd3!
  • Keys
    • 1.Qf1!
      • 1...Ke5
        • 2.Qf4#
      • 1...e2
        • 2.Qxe2#
      • 1...d3
        • 2.Qf4#
      • 1...g5
        • 2.Qf5#

This anticipates 79228(1953), 77680(1960), 135534(1988)

FEATURES

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