Problem Display
PID: 108206 (3K4/N7/3Q4/k7/8/8/Bp6/R7 w - - 0 1)

Bie, Hans Petter

Norsk Sjakkblad, 2001

3K4/N7/3Q4/k7/8/8/Bp6/R7

#2

5 + 2


6490 yacpdb 2009

SOLUTION


  • SOUND
  • Sets
    • 1...b1Q
      • 2.Bxb1#
    • 1...b1S
      • 2.Bxb1#
    • 1...b1B
      • 2.Bxb1#
    • 1...b1R
      • 2.Bxb1#
  • Tries
    • 1.Kc7?
      • threat
        • 2.Qa3#
      • 1...b1S
        • 2.Bxb1#
      • 1...Ka4!
    • 1.Qb4+?
      • 1...Ka6
        • 2.Bc4#
      • 1...Kxb4!
    • 1.Qb6+?
      • 1...Ka4
        • 2.Bb3#
      • 1...Kxb6!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Qb5#
      • 1...Ka4
        • 2.Bb3#
      • 1...Ka6
        • 2.Bc4#
      • 1...b1Q
        • 2.Bxb1#
      • 1...b1R
        • 2.Bxb1#

FEATURES


  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • P(a);N_GUARD::R(A)+B(B),XQ(a)
    • P(a);N_GUARD::R(A)+B(B),XS(a)
    • P(a);N_GUARD::R(A)+B(B),XB(a)
    • P(a);N_GUARD::R(A)+B(B),XR(a)
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Threat
        • QAR2(C)
      • Vars
        • P(a);N_GUARD::R(A)+B(B),XS(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::R(A)+B(B),DCHECK
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::R(A)+B(B),DCHECK
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • K(b);P-FLIGHT::R(A)+B(B),DCHECK
      • P(a);N_GUARD::R(A)+B(B),XQ(a)
      • P(a);N_GUARD::R(A)+B(B),XR(a)


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).