MESON Chess Problem Database

Problem Display
PID: 178743 (3K4/3N4/8/3Q4/k7/8/3p2p1/N7 w - - 0 1)

Froberg, Johan Hilding Laurentius

Springaren, 1949

3K4/3N4/8/3Q4/k7/8/3p2p1/N7

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ka3
      • 2.Qb3#
  • Tries
    • 1.Sb6+?
      • 1...Ka3
        • 2.Qb3#
      • 1...Kb4!
    • 1.Qb5+?
      • 1...Ka3
        • 2.Qb3#
      • 1...Kxb5!
  • Keys
    • 1.Qc4+!
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka5
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT::QAR1(B)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
      • Refutation
        • K(c);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);CHECK
    • Vars
      • K(c);P-FLIGHT::QAR1(B)
      • K(c);P-FLIGHT::S(A)
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).