MESON Chess Problem Database

Problem Display
PID: 276523 (7B/8/6B1/8/5Q2/7p/p1q5/1k3K1R w - - 0 1)

Hannelius, Jan Ingvar

Stella Polaris, 1970

7B/8/6B1/8/5Q2/7p/p1q5/1k3K1R

#2

5 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3+
      • 2.Bxd3#
    • 1...Qe4
      • 2.Bxe4#
    • 1...Qf5
      • 2.Bxf5#
  • Tries
    • 1.Qd2?
      • threat
        • 2.Ke2#
        • 2.Kf2#
        • 2.Bxc2#
        • 2.Qe1#
        • 2.Qd1#
        • 2.Qxc2#
      • 1...Qd3+
        • 2.Kf2#
        • 2.Bxd3#
      • 1...Qf5+
        • 2.Ke2#
        • 2.Bxf5#
      • 1...Qxg6
        • 2.Qd1#
        • 2.Qb2#
      • 1...a1Q
        • 2.Qxc2#
      • 1...a1B
        • 2.Qxc2#
      • 1...a1R
        • 2.Qxc2#
      • 1...Qe4
        • 2.Kf2#
        • 2.Bxe4#
        • 2.Qd1#
        • 2.Qb2#
      • 1...a1S!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Qxc2#
      • 1...Qd3+
        • 2.Kf2#
      • 1...Qf5+
        • 2.Ke2#
      • 1...Kc1
        • 2.Qxc2#
      • 1...Qxg6
        • 2.Qd1#
      • 1...a1S
        • 2.Qxa1#
      • 1...Qe4
        • 2.Kf2#
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(c);CHECK,OGATEB::B(D),XQ(c)
    • Q(c);OGATEB::B(D),XQ(c)
    • Q(c);OGATEB,P_PINQ(C)::B(D),XQ(c)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(6)
      • Vars
        • P(b);::QAB1(C),XQ(c)
      • Refutation
        • P(b);
  • Actual
    • Q(C);
    • Threat
      • QAB1(C),XQ(c)
    • Vars
      • Q(c);CHECK::R(B)+K(A)
      • K(a);N_SPINQ(c),P-FLIGHT::QAR1(C),XQ(c)
      • Q(c);N_SPINQ(c),OGATE,XB(D)::QAR2(C)
      • P(b);OGATE::QAR1(C),XS(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).