MESON Chess Problem Database

Problem Display
PID: 176169 (2Q5/3p4/8/7P/4k3/1P6/3K3B/8 w - - 0 1)

Stahl, Hubert

Schach-Echo, 1960

2Q5/3p4/8/7P/4k3/1P6/3K3B/8

#2

5 + 2

6490 yacpdb 2018
5454 Near Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qc4#
    • 1...Kd5
      • 2.Qc4#
    • 1...d5
      • 2.Qg4#
  • Tries
    • 1.Qc2+?
      • 1...Kd4
        • 2.Qc4#
      • 1...Kd5
        • 2.Qc4#
      • 1...Kf3!
    • 1.Qc3?
      • threat
        • 2.Qd3#
      • 1...Kd5
        • 2.Qc4#
      • 1...Kf5!
    • 1.Qc4+?
      • 1...Kf3
        • 2.Qe2#
      • 1...Kf5!
    • 1.Qe8+?
      • 1...Kf3
        • 2.Qe2#
      • 1...Kd4
        • 2.Qe5#
      • 1...Kf5
        • 2.Qg6#
      • 1...Kd5!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Qd3#
      • 1...Kf3
        • 2.Qe2#
      • 1...Kd4
        • 2.Qc4#
      • 1...Kd5
        • 2.Qc4#
      • 1...Kf5
        • 2.Qg6#

Anticipated by 24215(1957)

This anticipates 147073(1996)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::QAR1(E)
    • K(a);S_FLIGHT::QAB1(E)
    • P(b);OGATE,SBLOCK::QAR2(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(E)
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(E)
        • K(a);P-FLIGHT::QAB1(E)
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(E);
    • Threat
      • QAB1(E)
    • Vars
      • K(a);S_FLIGHT::QAB1(E)
      • K(a);P-FLIGHT::QAR1(E)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).