MESON Chess Problem Database

Problem Display
PID: 227674 (7K/3k4/8/8/7B/6Q1/6B1/8 w - - 0 1)

Schulz, Ernst

Arbeiter Shachzeitung (Chemnitz), 1926

7K/3k4/8/8/7B/6Q1/6B1/8

#2

4 + 1

6490 yacpdb 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Bh3+?
      • 1...Ke8
        • 2.Qg8#
      • 1...Kc6!
    • 1.Qd6+?
      • 1...Kc8
        • 2.Qd8#
      • 1...Ke8
        • 2.Qe7#
      • 1...Kxd6!
    • 1.Qd3+?
      • 1...Ke6
        • 2.Qd5#
      • 1...Kc7
        • 2.Qd8#
      • 1...Kc8
        • 2.Qd8#
      • 1...Ke8!
    • 1.Qg7+?
      • 1...Kd6
        • 2.Qe7#
      • 1...Kc8
        • 2.Qb7#
      • 1...Ke8
        • 2.Bc6#
        • 2.Qe7#
      • 1...Ke6!
    • 1.Qg8?
      • 1...Kc7
        • 2.Qd8#
      • 1...Kd6!
  • Keys
    • 1.Qg5!
      • 1...Kd6
        • 2.Qe7#
      • 1...Ke6
        • 2.Qd5#
      • 1...Kc7
        • 2.Qd8#
      • 1...Kc8
        • 2.Qd8#
      • 1...Ke8
        • 2.Qe7#

Anticipated by 49566(0000), 2175(1858), 47351(1888), 181089(1904), 121530(1905), 182335(1906), 182229(1906), 194004(1917), 195071(1918), 205689(1925), 227459(1926), 227672(1926)

This anticipates 174121(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
      • B(A);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(B)
        • K(a);S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
        • K(a);OGATE,P-FLIGHT::QAB1(B)
        • K(a);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(B)
        • K(a);OGATE,S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);P-FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);P-FLIGHT::QAB1(B)
      • K(a);S_FLIGHT::QAB1(B)
      • K(a);S_FLIGHT::QAR1(B)
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