MESON Chess Problem Database

Problem Display
PID: 6501 (3K1k1N/7Q/6B1/8/8/3b4/8/5r2 w - - 0 1)

Lebedev, Aleksandr N

Zadachi i Etyudi, 1929

3K1k1N/7Q/6B1/8/8/3b4/8/5r2

#2

4 + 3

3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991
5454 Near Snap 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qf7#
    • 1...Rb1
      • 2.Qf7#
    • 1...Rc1
      • 2.Qf7#
    • 1...Rd1
      • 2.Qf7#
    • 1...Re1
      • 2.Qf7#
    • 1...Rg1
      • 2.Qf7#
    • 1...Rh1
      • 2.Qf7#
    • 1...Rf7
      • 2.Qxf7#
    • 1...Bf5
      • 2.Qf7#
    • 1...Bxg6
      • 2.Sxg6#
  • Tries
    • 1.Bxd3?
      • threat
        • 2.Sg6#
      • 1...Rg1
        • 2.Qf7#
      • 1...Rf6!
  • Keys
    • 1.Bf5!
      • threat
        • 2.Sg6#
        • 2.Qf7#
      • 1...Rxf5
        • 2.Sg6#
      • 1...Bxf5
        • 2.Qf7#
      • 1...Rg1
        • 2.Qf7#
      • 1...Bc4
        • 2.Sg6#

This anticipates 77258(1963)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • R(a);N_GUARD::QAR1(B)
    • R(a);N_GUARD::QAR1(B),XR(a)
    • B(b);S_CUTR(a)::QAR1(B)
    • B(b);XB(A)::S(D),XB(b)
  • Tries
    • Try
      • B(A);XB(b)
      • Threat
        • S(D)
      • Vars
        • R(a);N_GUARD::QAR1(B)
      • Refutation
        • R(a);
  • Actual
    • B(A);
    • Threat
      • DUALS(2)
    • Vars
      • R(a);XB(A)::S(D)
      • B(b);XB(A)::QAR1(B)
      • R(a);::QAR1(B)
      • B(b);::S(D)
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).