MESON Chess Problem Database

Problem Display
PID: 180228 (8/1P2P3/8/4n3/8/2K5/4k3/6QB w - - 0 1)

Lider, Valentin Viktorovich

Shakhmaty v SSSR, 1973

8/1P2P3/8/4n3/8/2K5/4k3/6QB

#2

5 + 2

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Qf2+?
      • 1...Kd1
        • 2.Qf1#
        • 2.Qd2#
      • 1...Kxf2!
    • 1.Qg2+?
      • 1...Kd1
        • 2.Qf1#
        • 2.Qd2#
      • 1...Ke3
        • 2.Qd2#
      • 1...Ke1!
    • 1.b8Q?
      • threat
        • 2.Qxe5#
        • 2.Qb2#
      • 1...Sf3
        • 2.Qb5#
      • 1...Sc4
        • 2.Qbh2#
      • 1...Sg4
        • 2.Qb2#
        • 2.Qb5#
      • 1...Sc6
        • 2.Qbh2#
        • 2.Qb2#
        • 2.Qb5#
      • 1...Sg6
        • 2.Qbh2#
        • 2.Qb2#
        • 2.Qb5#
      • 1...Sd7
        • 2.Qbh2#
        • 2.Qb2#
        • 2.Qb5#
      • 1...Sf7
        • 2.Qbh2#
        • 2.Qb2#
        • 2.Qb5#
      • 1...Sd3!
  • Keys
    • 1.e8B!
      • 1...Sd3
        • 2.Bh5#
      • 1...Sf3
        • 2.Bb5#
      • 1...Sc4
        • 2.Bh5#
      • 1...Sg4
        • 2.Bb5#
      • 1...Sc6
        • 2.Bh5#
      • 1...Sg6
        • 2.Bb5#
      • 1...Sd7
        • 2.Bh5#
      • 1...Sf7
        • 2.Bb5#

Anticipated by 23011(1938), 180080(1946), 249053(1947)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);P-FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(D);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_GUARD::QAB(D)
        • S(b);OGATE::QAR(D)
      • Refutation
        • S(b);
  • Actual
    • P(E);
    • Vars
      • S(b);N_GUARD::B(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).