MESON Chess Problem Database

Problem Display
PID: 227672 (4B3/5Q2/8/8/1k3K2/8/8/B7 w - - 0 1)

Lies, Heinz

Arbeiter Shachzeitung (Chemnitz), 1926

4B3/5Q2/8/8/1k3K2/8/8/B7

#2

4 + 1

6490 yacpdb 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Qc4+?
      • 1...Ka3
        • 2.Qa4#
      • 1...Ka5
        • 2.Qb5#
      • 1...Kxc4!
    • 1.Qa7?
      • 1...Kb3
        • 2.Qa4#
      • 1...Kc4!
    • 1.Qb7+?
      • 1...Ka3
        • 2.Qb2#
      • 1...Kc4
        • 2.Qb5#
      • 1...Ka5
        • 2.Bc3#
        • 2.Qb5#
      • 1...Kc5!
  • Keys
    • 1.Qd7!
      • 1...Ka3
        • 2.Qa4#
      • 1...Kb3
        • 2.Qa4#
      • 1...Kc4
        • 2.Qb5#
      • 1...Ka5
        • 2.Qb5#
      • 1...Kc5
        • 2.Qd4#

Anticipated by 2175(0000), 49566(0000), 47351(1888), 181089(1904), 121530(1905), 182335(1906), 182229(1906), 194004(1917), 195071(1918), 205689(1925)

This anticipates 174121(1926), 227459(1926), 227673(1926), 227674(1926), 227676(1926), 77127(1948), 10704(1967), 11832(1972), 12251(1976), 196647(1999), 248693(2007)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(C)
        • K(a);S_FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XQ(C)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::QAB1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(C)
        • K(a);P-FLIGHT::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(a);S_FLIGHT::QAR1(C)
      • K(a);P-FLIGHT::QAB1(C)
      • K(a);S_FLIGHT::QAB1(C)
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