MESON Chess Problem Database

Problem Display
PID: 181753 (8/2B5/2p1p3/3k4/6N1/1K2Q3/8/b7 w - - 0 1)

Novak, Jan

Lidove noviny, 1905

8/2B5/2p1p3/3k4/6N1/1K2Q3/8/b7

#2

4 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qxe5#
    • 1...Bf6
      • 2.Sxf6#
  • Tries
    • 1.Qd3+?
      • 1...Kc5
        • 2.Qc4#
      • 1...Bd4!
    • 1.Qe4+?
      • 1...Kc5
        • 2.Qc4#
      • 1...Kxe4!
    • 1.Qxe6+?
      • 1...Kd4
        • 2.Qc4#
      • 1...Kc5
        • 2.Qc4#
      • 1...Kxe6!
  • Keys
    • 1.Be5!
      • threat
        • 2.Sf6#
      • 1...Bxe5
        • 2.Qxe5#
      • 1...Bd4
        • 2.Qxd4#
      • 1...c5
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::QAR1(B),XB(a)
    • B(a);N_GUARD::S(C),XB(a)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK,XP(d)
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
  • Actual
    • B(D);
    • Threat
      • S(C)
    • Vars
      • B(a);OGATE,XB(D)::QAR1(B),XB(a)
      • B(a);N_GUARD::QAR1(B),XB(a)
      • P(c);SBLOCK::QAB(B)
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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).