MESON Chess Problem Database

Problem Display
PID: 175225 (5bK1/5p2/5QP1/1q5p/1R1NN3/8/2PP2p1/4k3 w - - 0 1)

Ferber, Eugene

The Times, 1902

5bK1/5p2/5QP1/1q5p/1R1NN3/8/2PP2p1/4k3

#2

8 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Rb1#
    • 1...Qd3
      • 2.Rb1#
    • 1...Qa4
      • 2.Rb1#
    • 1...Qc4
      • 2.Rb1#
    • 1...Qa6
      • 2.Rb1#
    • 1...Qc6
      • 2.Rb1#
    • 1...Qd7
      • 2.Rb1#
    • 1...Qe8
      • 2.Rb1#
    • 1...Qa5
      • 2.Rb1#
    • 1...Qc5
      • 2.Rb1#
    • 1...Qd5
      • 2.Rb1#
    • 1...Qe5
      • 2.Rb1#
    • 1...Qf5
      • 2.Rb1#
    • 1...Qg5
      • 2.Rb1#
  • Tries
    • 1.Qh4+?
      • 1...Kf1
        • 2.Qf2#
      • 1...Kd1!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Qa1#
      • 1...Kd1
        • 2.Qa1#
      • 1...Kf1
        • 2.Rb1#
        • 2.Qa1#
      • 1...Qxa6
        • 2.Rb1#
      • 1...Qxb4
        • 2.Qe2#
      • 1...Qe2
        • 2.Qxe2#
      • 1...Qa4
        • 2.Rb1#
        • 2.Qe2#
      • 1...Qa5
        • 2.Rb1#
        • 2.Qe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 13
  • Sets
    • Q(c);N_GUARD::R(C)
    • Q(c);N_GUARD,P_PINP(G)::R(C)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(F)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(F);
    • Threat
      • QAR(F)
    • Vars
      • K(a);P-FLIGHT::QAR(F)
      • Q(c);N_GUARD,XQ(F)::R(C)
      • Q(c);OGATE,XR(C)::QAR1(F)
      • Q(c);OGATE::QAR1(F),XQ(c)
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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).