MESON Chess Problem Database

Problem Display
PID: 196647 (1Q6/4K3/8/8/4k2p/N6B/8/6B1 w - - 0 1)

Baldinu, Salvatore

Comm., L'Italia Scacchistica, 1999

1Q6/4K3/8/8/4k2p/N6B/8/6B1

#2

5 + 2

133 The Problemist Supplement 2019
5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Bg2#
  • Tries
    • 1.Qh2?
      • 1...Kd3
        • 2.Qc2#
      • 1...Kd5
        • 2.Bg2#
      • 1...Kf3!
    • 1.Qg3?
      • 1...Kd5
        • 2.Bg2#
      • 1...hxg3!
    • 1.Qf4+?
      • 1...Kd3
        • 2.Qe3#
      • 1...Kd5
        • 2.Bg2#
      • 1...Kxf4!
    • 1.Qe5+?
      • 1...Kd3
        • 2.Qe3#
      • 1...Kf3
        • 2.Qe3#
      • 1...Kxe5!
    • 1.Qa7?
      • 1...Kd3
        • 2.Qe3#
      • 1...Kf3
        • 2.Qe3#
      • 1...Kf4
        • 2.Qe3#
      • 1...Ke5
        • 2.Qd4#
      • 1...Kd5!
    • 1.Qc7?
      • 1...Kd3
        • 2.Qc2#
      • 1...Kd5
        • 2.Bg2#
      • 1...Kf3!
    • 1.Qb3?
      • 1...Kf4
        • 2.Qe3#
      • 1...Ke5!
    • 1.Qb4+?
      • 1...Kd3
        • 2.Bf1#
      • 1...Kf3
        • 2.Qg4#
      • 1...Ke5
        • 2.Qd4#
      • 1...Kd5!
    • 1.Qc8?
      • threat
        • 2.Qf5#
      • 1...Kd3
        • 2.Qc2#
      • 1...Kf3
        • 2.Qg4#
      • 1...Kd5
        • 2.Qe6#
      • 1...Ke5
        • 2.Qf5#
      • 1...Kf4!
  • Keys
    • 1.Qb6!
      • 1...Kd3
        • 2.Qe3#
      • 1...Kf3
        • 2.Qe3#
      • 1...Kf4
        • 2.Qe3#
      • 1...Kd5
        • 2.Qe6#
      • 1...Ke5
        • 2.Qd4#

Anticipated by 49566(0000), 2175(1858), 47351(1888), 181089(1904), 121530(1905), 182229(1906), 182335(1906), 194004(1917), 195071(1918), 227674(1926), 227673(1926), 227672(1926), 227459(1926), 174121(1926), 77127(1948), 10704(1967), 11832(1972), 12251(1976)

This anticipates 248693(2007)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::B(C)
  • Tries
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
        • K(a);S_FLIGHT::B(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT::B(C)
      • Refutation
        • P(b);XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(E)
        • K(a);S_FLIGHT::B(C)
      • Refutation
        • K(a);P-FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,XQ(E)
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT::QAR1(E)
        • K(a);P-FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
        • K(a);S_FLIGHT::B(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);P-FLIGHT::QAB1(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT::B(C)
        • K(a);OGATE,S_FLIGHT::QAB1(E)
        • K(a);P-FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
        • K(a);P-FLIGHT::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(a);S_FLIGHT::QAR1(E)
      • K(a);P-FLIGHT::QAB1(E)
      • K(a);S_FLIGHT::QAB1(E)
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