MESON Chess Problem Database

Problem Display
PID: 109511 (8/8/K7/8/8/5N2/Q1P1kp2/7B w - - 0 1)

Chakirov, R

C Moscovite, 1992

8/8/K7/8/8/5N2/Q1P1kp2/7B

#2

5 + 2

6490 yacpdb 2009
5454 Near Snap 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Kf1
      • 2.Qc4#
  • Tries
    • 1.Qd5?
      • threat
        • 2.Qd3#
      • 1...Kf1
        • 2.Qc4#
        • 2.Qd1#
        • 2.Qd3#
        • 2.Qb5#
      • 1...Ke3
        • 2.Qe5#
      • 1...f1Q
        • 2.Qd2#
      • 1...f1B
        • 2.Qd2#
      • 1...f1R
        • 2.Qd2#
      • 1...f1S!
    • 1.Qe6+?
      • 1...Kf1
        • 2.Qc4#
      • 1...Kd1!
  • Keys
    • 1.Qa5!
      • 1...Kd1
        • 2.Qd2#
      • 1...Kf1
        • 2.Qb5#
      • 1...Ke3
        • 2.Qe5#
      • 1...f1Q
        • 2.Qd2#
      • 1...f1S
        • 2.Qe1#
      • 1...f1B
        • 2.Qe1#
        • 2.Qd2#
      • 1...f1R
        • 2.Qd2#

Anticipated by 20987(1915), 227200(1952), 269480(1954)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAB(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
        • P(b);SBLOCK::QAR1(B)
      • Refutation
        • P(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB(B)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);S_FLIGHT::QAR1(B)
      • K(a);S_FLIGHT::QAB(B)
      • K(a);P-FLIGHT::QAR2(B)
      • P(b);SBLOCK::QAR1(B)
      • P(b);N_GUARD::QAR1(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).