MESON Chess Problem Database

Problem Display
PID: 208731 (8/8/8/NN1Q4/8/8/1k6/4K3 w - - 0 1)

White, ALC

Watertown (New York) Re-Union, 1875

8/8/8/NN1Q4/8/8/1k6/4K3

#2

4 + 1

5454 Near Snap 2020
3713 Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Sa3?
      • 1...Kc1
        • 2.Qd2#
      • 1...Kxa3
        • 2.Qb3#
      • 1...Kc3
        • 2.Qd2#
      • 1...Ka1!
    • 1.Qa2+?
      • 1...Kc1
        • 2.Sb3#
      • 1...Kxa2!
  • Keys
    • 1.Sc3!
      • 1...Ka1
        • 2.Qa2#
      • 1...Kc1
        • 2.Qd2#
      • 1...Kc2
        • 2.Qd2#
      • 1...Ka3
        • 2.Qb3#
      • 1...Kxc3
        • 2.Qd2#

This anticipates 223474(1926), 132484(1964), 77651(1998)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Vars
        • K(a);S_FLIGHT::QAB1(D)
        • K(a);S_FLIGHT,XS(C)::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);S_FLIGHT::S(B)
      • Refutation
        • K(a);P-FLIGHT,XQ(D)
  • Actual
    • S(C);
    • Vars
      • K(a);S_FLIGHT::QAR1(D)
      • K(a);S_FLIGHT::QAB1(D)
      • K(a);P-FLIGHT::QAR1(D)
      • K(a);S_FLIGHT,XS(C)::QAB1(D)
HTML5 logo

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).