MESON Chess Problem Database

Problem Display
PID: 100859 (R4K1k/5P2/6B1/4q3/7N/8/8/B3r1rR w - - 0 1)

Betts, Frederick Charles

Good Companions, 1921

R4K1k/5P2/6B1/4q3/7N/8/8/B3r1rR

#2

7 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qf6
      • 2.Bxf6#
    • 1...Qg7+
      • 2.Bxg7#
    • 1...Rb1
      • 2.Bxe5#
    • 1...Rc1
      • 2.Bxe5#
    • 1...Rd1
      • 2.Bxe5#
    • 1...Rxg6
      • 2.Sxg6#
  • Keys
    • 1.Be4!
      • threat
        • 2.Sg6#
      • 1...Qg7+
        • 2.Ke7#
      • 1...Rg8+
        • 2.fxg8Q#
        • 2.fxg8R#
      • 1...Rxh1
        • 2.Bxe5#
      • 1...Rg6
        • 2.Sxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(c);OGATE,P_PINP(E)::B(A),XQ(c)
    • Q(c);CHECK,OGATE::B(A),XQ(c)
    • R(a);N_GUARD::B(A),XQ(c)
    • R(b);XB(D)::R(B)+S(C),DCHECK,XR(b)
  • Actual
    • B(D);
    • Threat
      • R(B)+S(C),DCHECK
    • Vars
      • Q(c);CHECK::R(F)+K(G)
      • R(b);CHECK,OGATE::PXR(b)=Q
      • R(b);N_GUARD,XR(B)::B(A),XQ(c)
      • R(b);::R(B)+S(C),DCHECK,XR(b)
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).