MESON Chess Problem Database

Problem Display
PID: 182229 (Q7/8/7K/4k3/8/7B/5B2/8 w - - 0 1)

Schroder, Heinrich

Rivista Scacchistica Italiana, 1906

Q7/8/7K/4k3/8/7B/5B2/8

#2

4 + 1

5454 Near Snap 2018
6490 yacpdb 2018
3713 Snap 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Bg3+?
      • 1...Kf6
        • 2.Qf8#
      • 1...Kd4!
    • 1.Qd5+?
      • 1...Kf4
        • 2.Qf5#
      • 1...Kf6
        • 2.Bh4#
        • 2.Qe6#
      • 1...Kxd5!
    • 1.Qa5+?
      • 1...Ke4
        • 2.Qf5#
      • 1...Kf4
        • 2.Qf5#
      • 1...Kd6
        • 2.Qc5#
      • 1...Kf6!
    • 1.Qe8+?
      • 1...Kf4
        • 2.Qe3#
      • 1...Kd5
        • 2.Qe6#
      • 1...Kf6
        • 2.Bd4#
        • 2.Bh4#
        • 2.Qe6#
      • 1...Kd6!
    • 1.Qf8?
      • 1...Ke4
        • 2.Qf5#
      • 1...Kd5!
  • Keys
    • 1.Qc8!
      • 1...Ke4
        • 2.Qf5#
      • 1...Kf4
        • 2.Qf5#
      • 1...Kd5
        • 2.Qe6#
      • 1...Kd6
        • 2.Qc5#
      • 1...Kf6
        • 2.Qe6#

Anticipated by 49566(0000), 2175(1858), 47351(1888), 181089(1904), 121530(1905)

This anticipates 182335(1906), 194004(1917), 195071(1918), 205689(1925), 227676(1926), 174121(1926), 227459(1926), 227672(1926), 227673(1926), 227674(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(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT,XQ(D)
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAB1(D)
        • K(a);OGATE,S_FLIGHT::QAR1(D)
        • K(a);S_FLIGHT::QAB1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(D)
        • K(a);P-FLIGHT::QAB1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(D);
      • Vars
        • K(a);P-FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(D);
    • Vars
      • K(a);P-FLIGHT::QAB1(D)
      • K(a);S_FLIGHT::QAR1(D)
      • K(a);S_FLIGHT::QAB1(D)
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