MESON Chess Problem Database

Problem Display
PID: 268781 (8/8/8/2K5/3Nkp2/4p3/8/4BQ2 w - - 0 1)

Onkoud, Abdelaziz

Problemas, 2020

8/8/8/2K5/3Nkp2/4p3/8/4BQ2

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...e2
      • 2.Qxe2#
  • Tries
    • 1.Qd3+?
      • 1...Ke5
        • 2.Qf5#
      • 1...Kxd3!
    • 1.Qh3?
      • threat
        • 2.Qf5#
      • 1...Kd3
        • 2.Qf5#
        • 2.Qh7#
      • 1...Ke5
        • 2.Qf5#
        • 2.Qe6#
      • 1...e2!
    • 1.Qc4?
      • 1...Ke5
        • 2.Qe6#
      • 1...e2
        • 2.Qxe2#
      • 1...f3!
    • 1.Qa6?
      • 1...Ke5
        • 2.Qe6#
      • 1...e2
        • 2.Qxe2#
      • 1...f3!
    • 1.Qxf4+?
      • 1...Kd3
        • 2.Qf5#
      • 1...Kxf4!
  • Keys
    • 1.Bg3!
      • 1...Ke5
        • 2.Qxf4#
      • 1...fxg3
        • 2.Qf5#
      • 1...e2
        • 2.Qxe2#
      • 1...f3
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::QAR2(B),XP(a)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Vars
        • K(b);N_GUARD,P-FLIGHT::QAR1(B)
        • P(a);OGATEB::QAR2(B),XP(a)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Vars
        • K(b);N_GUARD,P-FLIGHT::QAR1(B)
        • P(a);OGATEB::QAR2(B),XP(a)
      • Refutation
        • P(c);
    • Try
      • Q(B);CHECK,XP(c)
      • Vars
        • K(b);S_FLIGHT::QAB(B)
      • Refutation
        • K(b);P-FLIGHT,XQ(B)
  • Actual
    • B(A);
    • Vars
      • K(b);N_GUARD,P-FLIGHT,P_SPINP(c)::QAB1(B),XP(c)
      • P(c);OGATE,XB(A)::QAB1(B)
      • P(a);OGATEB::QAR2(B),XP(a)
      • P(c);::QAB(B)
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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).