MESON Chess Problem Database

Problem Display
PID: 33253 (8/3Q3R/3PK3/5rp1/3B2k1/3N2p1/6B1/8 w - - 0 1)

Kallaway, AF

Birmingham Post, 1921

8/3Q3R/3PK3/5rp1/3B2k1/3N2p1/6B1/8

#2

7 + 4

3360 Simple Two-move Themes 1924
3310 2345 Chess Problems 1997
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rf3
      • 2.Bh3#
    • 1...Rf4
      • 2.Se5#
    • 1...Rd5
      • 2.Kxd5#
    • 1...Re5+
      • 2.Kxe5#
    • 1...Rf6+
      • 2.Kxf6#
    • 1...Rf7
      • 2.Kxf7#
  • Tries
    • 1.Se5+?
      • 1...Rxe5+
        • 2.Kxe5#
      • 1...Kf4!
  • Keys
    • 1.Qa4!
      • 1...Re5+
        • 2.Bxe5#
      • 1...Rf6+
        • 2.Bxf6#
      • 1...Rf1
        • 2.Bf2#
      • 1...Rf2
        • 2.Bxf2#
      • 1...Rf3
        • 2.Bh3#
      • 1...Rf4
        • 2.Se5#
      • 1...Ra5
        • 2.Qd1#
      • 1...Rb5
        • 2.Qd1#
      • 1...Rc5
        • 2.Bxc5#
        • 2.Qd1#
      • 1...Rd5
        • 2.Qd1#
      • 1...Rf7
        • 2.Bf6#
      • 1...Rf8
        • 2.Bf6#

This anticipates 165141(1970)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(c);SBLOCK::B(A)
    • R(c);N_GUARD,SBLOCK::S(B)
    • R(c);::QAB(F)+K(E),XR(c)
    • R(c);CHECK::QAB(F)+K(E),XR(c)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • R(c);CHECK,XS(B)::QAB(F)+K(E),XR(c)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(F);
    • Vars
      • R(c);CHECK,N_GUARD::QAR(F)+B(C),XR(c)
      • R(c);N_GUARD::QAR(F)+B(C)
      • R(c);N_GUARD::QAR(F)+B(C),XR(c)
      • R(c);SBLOCK::B(A)
      • R(c);N_GUARD,SBLOCK::S(B)
      • R(c);N_GUARD::QAB(F)
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).