MESON Chess Problem Database

Problem Display
PID: 229003 (b7/r7/8/8/3p1K1k/8/8/1Q5B w - - 0 1)

Torngren, Pehr Hendrik

Aftonbladet, 1926

b7/r7/8/8/3p1K1k/8/8/1Q5B

#2

3 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qh7#
    • 1...Ra2
      • 2.Qh7#
    • 1...Ra3
      • 2.Qh7#
    • 1...Ra4
      • 2.Qh7#
    • 1...Rh7
      • 2.Qxh7#
    • 1...Bxh1
      • 2.Qxh1#
    • 1...Bb7
      • 2.Qh7#
  • Tries
    • 1.Qe1+?
      • 1...Kh3
        • 2.Qg3#
      • 1...Kh5!
  • Keys
    • 1.Bb7!
      • threat
        • 2.Qh7#
        • 2.Qh1#
      • 1...Kh3
        • 2.Qh7#
        • 2.Qh1#
      • 1...Kh5
        • 2.Qh7#
      • 1...Rxb7
        • 2.Qh1#
      • 1...Bxb7
        • 2.Qh7#
      • 1...Ra1
        • 2.Qh7#
      • 1...Ra2
        • 2.Qh7#
      • 1...Ra3
        • 2.Qh7#
      • 1...Ra5
        • 2.Qh1#
      • 1...Ra6
        • 2.Qh1#
      • 1...d3
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • R(c);N_GUARD::QAR(A)
    • R(c);N_GUARD,SBLOCK::QAR(A)
    • R(c);N_GUARD::QAR(A),XR(c)
    • B(d);OGATE,XB(B)::QAR(A),XB(d)
    • B(d);S_CUTR(c)::QAR(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • B(B);
    • Threat
      • DUALS(2)
    • Vars
      • K(b);P-FLIGHT::QAR2(A)
      • R(c);XB(B)::QAR(A)
      • B(d);XB(B)::QAR(A)
      • R(c);::QAR(A)
      • R(c);SBLOCK::QAR(A)
      • P(a);::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).