MESON Chess Problem Database

Problem Display
PID: 276777 (3rR1Q1/B4q2/pN4N1/K1p1b3/3k2b1/1p3P1r/3P3n/1B6 w - - 0 1)

Halldorsson, Ragnar

Stella Polaris, 1971

3rR1Q1/B4q2/pN4N1/K1p1b3/3k2b1/1p3P1r/3P3n/1B6

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Qxc4#
    • 1...Qxg6
      • 2.Qc4#
    • 1...Qxe8
      • 2.Qc4#
    • 1...Qxf3
      • 2.Qc4#
    • 1...Qf4
      • 2.Qc4#
    • 1...Qf5
      • 2.Qc4#
    • 1...Qf6
      • 2.Qc4#
    • 1...Qxa7
      • 2.Qc4#
    • 1...Qb7
      • 2.Qc4#
    • 1...Qc7
      • 2.Qc4#
    • 1...Qd7
      • 2.Qc4#
    • 1...Qe7
      • 2.Qc4#
    • 1...Qg7
      • 2.Qc4#
    • 1...Qh7
      • 2.Qc4#
    • 1...Qf8
      • 2.Qc4#
    • 1...Bg3
      • 2.Re4#
    • 1...Bf4
      • 2.Re4#
    • 1...Bd6
      • 2.Re4#
    • 1...Bf6
      • 2.Re4#
    • 1...Bc7
      • 2.Re4#
    • 1...Bg7
      • 2.Re4#
    • 1...Bb8
      • 2.Re4#
    • 1...Bh8
      • 2.Re4#
  • Tries
    • 1.Qxf7?
      • threat
        • 2.Qc4#
      • 1...c4
        • 2.Sa4#
        • 2.Sxc4#
        • 2.Sd5#
        • 2.Sd7#
        • 2.Sa8#
        • 2.Sc8#
        • 2.Qxc4#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Be6!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Se2#
      • 1...Qxf4
        • 2.Qc4#
      • 1...Bxf3
        • 2.Qg1#
      • 1...Bxf4
        • 2.Re4#
      • 1...c4
        • 2.Sd7#
      • 1...Qc4
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 20
  • Sets
    • Q(i);OGATE::QAR1(I),XQ(i)
    • Q(i);OGATE,XS(F)::QAR1(I)
    • Q(i);OGATE,XR(H)::QAR1(I)
    • Q(i);OGATE,XP(C)::QAR1(I)
    • Q(i);OGATE::QAR1(I)
    • Q(i);OGATE,XB(G)::QAR1(I)
    • Q(i);OGATE,P_PINS(E)::QAR1(I)
    • B(g);OGATE::R1(H)
    • B(g);OGATE,P_PINS(E)::R1(H)
  • Tries
    • Try
      • Q(I);XQ(i)
      • Threat
        • QAR1(I)
      • Vars
        • R(j);N_GUARD::QAR1(I),XR(j)
      • Refutation
        • B(e);
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • Q(i);OGATE,XS(F)::QAR1(I)
      • B(e);OGATE,XP(C)::QAB(I)
      • B(g);OGATE,XS(F)::R1(H)
      • P(f);SBLOCK::B(G)+S(E)
      • Q(i);OGATE::QAR1(I),XQ(i)
HTML5 logo

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).