MESON Chess Problem Database

Problem Display
PID: 41413 (8/4R3/8/3k2N1/P5P1/8/K4Q2/8 w - - 0 1)

Bonivento, Oscar

La Settimana Enigmistica, 1935

8/4R3/8/3k2N1/P5P1/8/K4Q2/8

#2

6 + 1

4436 Problemi Opera omnia 2001
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Tries
    • 1.Se4?
      • threat
        • 2.Qc5#
      • 1...Kc6
        • 2.Qc5#
      • 1...Kc4!
    • 1.Rc7?
      • threat
        • 2.Qc5#
      • 1...Kd6
        • 2.Qc5#
      • 1...Ke5!
    • 1.Rd7+?
      • 1...Kc4
        • 2.Qd4#
      • 1...Ke5
        • 2.Qd4#
        • 2.Qf5#
      • 1...Kc6!
  • Keys
    • 1.Se6!
      • 1...Kc4
        • 2.Qd4#
      • 1...Ke4
        • 2.Sf4#
      • 1...Ke5
        • 2.Qd4#
      • 1...Kc6
        • 2.Qc5#
      • 1...Kd6
        • 2.Qc5#

Anticipated by 6621(1932)

This anticipates 197826(1944), 12216(1976)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(E);
      • Threat
        • QAR1(B)
      • Vars
        • K(a);S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(F);
      • Threat
        • QAR1(B)
      • Vars
        • K(a);P-FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(F);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(E);
    • Vars
      • K(a);S_FLIGHT::QAR1(B)
      • K(a);S_FLIGHT::R(F)+S(E)
      • K(a);P-FLIGHT::QAB1(B)
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