Problem Display
PID: 18874 (8/3R4/8/8/8/7B/4pk1K/2B3N1 w - - 0 1)

Strigunov, P

Zvezda, 1958

8/3R4/8/8/8/7B/4pk1K/2B3N1

#2

5 + 2


3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991
5454 Near Snap 2007
133 The Problemist Supplement 2009

SOLUTION


  • SOUND
  • Sets
    • 1...e1Q
      • 2.Rf7#
    • 1...e1B
      • 2.Rf7#
    • 1...e1R
      • 2.Rf7#
  • Tries
    • 1.Be3+?
      • 1...Ke1
        • 2.Sf3#
      • 1...Kxe3!
    • 1.Bh6?
      • 1...e1Q
        • 2.Rf7#
      • 1...e1S
        • 2.Rd2#
      • 1...e1B
        • 2.Rf7#
      • 1...e1R
        • 2.Rf7#
      • 1...Ke1!
    • 1.Rd3?
      • 1...e1Q
        • 2.Rf3#
      • 1...e1S
        • 2.Be3#
      • 1...e1B
        • 2.Be3#
        • 2.Rf3#
      • 1...e1R
        • 2.Rf3#
      • 1...Ke1!
    • 1.Re7?
      • threat
        • 2.Rxe2#
      • 1...e1Q
        • 2.Rf7#
      • 1...e1S
        • 2.Be3#
        • 2.Re2#
      • 1...e1B
        • 2.Be3#
        • 2.Re2#
        • 2.Rf7#
      • 1...e1R
        • 2.Rf7#
      • 1...Ke1!
  • Keys
    • 1.Bg5!
      • 1...Ke1
        • 2.Bh4#
      • 1...e1Q
        • 2.Rf7#
      • 1...e1S
        • 2.Rd2#
      • 1...e1B
        • 2.Rf7#
      • 1...e1R
        • 2.Rf7#

This anticipates 51397(1959)

FEATURES


  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(a);SBLOCK::R(E)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(b);S_FLIGHT::S(B)
      • Refutation
        • K(b);S_FLIGHT,XB(A)
    • Try
      • B(A);
      • Vars
        • P(a);SBLOCK::R(E)
        • P(a);OGATEB,SBLOCK::R(E)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(E);
      • Vars
        • P(a);SBLOCK::R1(E)
        • P(a);SBLOCK::B(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(E);
      • Threat
        • R1(E),XP(a)
      • Vars
        • P(a);SBLOCK::R(E)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT
  • Actual
    • B(A);
    • Vars
      • K(b);S_FLIGHT::B(A)
      • P(a);SBLOCK::R(E)
      • P(a);OGATEB,SBLOCK::R(E)


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).