MESON Chess Problem Database

Problem Display
PID: 4899 (8/4Q3/2p5/K2k4/8/8/4B3/2NN4 w - - 0 1)

Ohquist, Johannes

Martaja, 1893

8/4Q3/2p5/K2k4/8/8/4B3/2NN4

#2

5 + 2

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Bd3?
      • 1...Kd4
        • 2.Qd6#
      • 1...c5!
    • 1.Bf3+?
      • 1...Kc4
        • 2.Qb4#
      • 1...Kd4!
    • 1.Qe6+?
      • 1...Kd4
        • 2.Sb3#
      • 1...Kc5
        • 2.Sb3#
        • 2.Qe5#
      • 1...Kxe6!
  • Keys
    • 1.Qf6!
      • 1...Ke4
        • 2.Bf3#
      • 1...Kc5
        • 2.Qe5#
      • 1...c5
        • 2.Sc3#

This anticipates 4908(1893)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(C);
      • Vars
        • K(a);P-FLIGHT::QAR2(E)
      • Refutation
        • P(b);
    • Try
      • B(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);P-FLIGHT::S(A)
      • Refutation
        • K(a);S_FLIGHT,XQ(E)
  • Actual
    • Q(E);
    • Vars
      • K(a);S_FLIGHT::B(C)
      • K(a);P-FLIGHT::QAR2(E)
      • P(b);SBLOCK::S(B)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).