MESON Chess Problem Database

Problem Display
PID: 243220 (4K3/4pR2/4k3/1pR1P3/3brB2/2n1p3/6P1/5Q2 w - - 0 1)

Thorsson, Allan Birger

Tidskrift for Schack, 1980

4K3/4pR2/4k3/1pR1P3/3brB2/2n1p3/6P1/5Q2

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sd5
      • 2.Rc6#
    • 1...b4
      • 2.Qa6#
  • Tries
    • 1.Qc4+?
      • 1...Sd5
        • 2.Rc6#
        • 2.Qxd5#
      • 1...bxc4!
    • 1.Qxb5?
      • threat
        • 2.Rc6#
        • 2.Qa6#
        • 2.Qc6#
        • 2.Qd7#
        • 2.Qb6#
      • 1...Bxc5
        • 2.Qd7#
      • 1...Bxe5
        • 2.Qd7#
      • 1...Sa4
        • 2.Rc6#
        • 2.Qc4#
        • 2.Qc6#
        • 2.Qd7#
        • 2.Qb3#
      • 1...Sd5
        • 2.Rc6#
        • 2.Qc6#
        • 2.Qd7#
      • 1...Sxb5!
  • Keys
    • 1.Qd3!
      • 1...Rxf4
        • 2.Rxe7#
      • 1...Rxe5
        • 2.Qg6#
      • 1...Bxc5
        • 2.Qd7#
      • 1...Bxe5
        • 2.Qd7#
      • 1...Sb1
        • 2.Qb3#
      • 1...Sd1
        • 2.Qb3#
      • 1...Sa2
        • 2.Qb3#
      • 1...Se2
        • 2.Qb3#
      • 1...Sa4
        • 2.Qb3#
      • 1...Sd5
        • 2.Rc6#
      • 1...e2
        • 2.Qh3#
      • 1...b4
        • 2.Qa6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • S(a);SBLOCK::R(D)
    • P(e);OGATE::QAR(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • P(e);XQ(A)
    • Try
      • Q(A);XP(e)
      • Threat
        • DUALS(5)
      • Vars
        • B(c);XR(D)::QAB1(A)
        • B(c);XP(E)::QAB1(A)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • Q(A);
    • Vars
      • R(d);XB(C)::R1(F),XP(g)
      • R(d);OGATE,XP(E)::QAR2(A)
      • B(c);OGATE,XR(D)::QAB1(A)
      • B(c);OGATE,XP(E)::QAB1(A)
      • S(a);OGATE::QAB(A)
      • S(a);SBLOCK::R(D)
      • P(b);OGATE::QAB(A)
      • P(e);OGATE::QAR(A)
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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).