MESON Chess Problem Database

Problem Display
PID: 230408 (8/8/4K1p1/8/3pk3/4p1P1/4Q3/8 w - - 0 1)

Riczu, Lajos

Deutsche Schachzeitung, 1976

8/8/4K1p1/8/3pk3/4p1P1/4Q3/8

#2

3 + 4

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.Qg4#
  • Tries
    • 1.Qd1?
      • 1...e2
        • 2.Qxe2#
      • 1...d3
        • 2.Qg4#
      • 1...g5!
    • 1.Qb5?
      • 1...e2
        • 2.Qxe2#
      • 1...d3
        • 2.Qd5#
      • 1...g5
        • 2.Qf5#
      • 1...Kf3!
  • Keys
    • 1.Qf1!
      • 1...e2
        • 2.Qxe2#
      • 1...d3
        • 2.Qf4#
      • 1...g5
        • 2.Qf5#

Anticipated by 213406(1973), 214977(1973)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::QAR2(A)
  • Tries
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
        • P(b);SBLOCK::QAR2(A)
      • Refutation
        • P(d);
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
        • P(b);::QAB1(A)
        • P(d);N_GUARD::QAB1(A)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(A);N_PINP(a)
    • Vars
      • P(a);OGATEB::QAR2(A),XP(a)
      • P(b);SBLOCK::QAR1(A)
      • P(d);N_GUARD::QAB1(A)
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