MESON Chess Problem Database

Problem Display
PID: 225534 (3B2K1/1P1k1P1Q/P2p4/8/1P3P2/8/8/8 w - - 0 1)

Jancek, Jan

Praca, 1952

3B2K1/1P1k1P1Q/P2p4/8/1P3P2/8/8/8

#2

8 + 2

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd8
      • 2.f8Q#
      • 2.f8R#
  • Tries
    • 1.Qe4?
      • threat
        • 2.Qe8#
      • 1...d5
        • 2.Qxd5#
      • 1...Kxd8!
    • 1.Qf5+?
      • 1...Kc6
        • 2.b5#
        • 2.b8S#
      • 1...Kxd8!
    • 1.Qh5?
      • 1...Kc6
        • 2.b8S#
      • 1...Ke6
        • 2.f8S#
      • 1...d5
        • 2.Qxd5#
      • 1...Kxd8!
    • 1.b8S+?
      • 1...Ke6
        • 2.Qe4#
      • 1...Kxd8
        • 2.f8Q#
        • 2.f8R#
      • 1...Kc8!
    • 1.f8Q+?
      • 1...Ke6
        • 2.Qhf5#
        • 2.Qhf7#
        • 2.Qff5#
        • 2.Qff7#
      • 1...Kc6!
    • 1.f8S+?
      • 1...Kxd8
        • 2.Qd7#
        • 2.b8Q#
        • 2.b8R#
      • 1...Ke8
        • 2.Qd7#
        • 2.Qe7#
      • 1...Kc6!
    • 1.f8B+?
      • 1...Ke6
        • 2.Qf7#
      • 1...Kxd8
        • 2.Qe7#
        • 2.b8Q#
        • 2.b8R#
      • 1...Ke8
        • 2.Qe7#
      • 1...Kc6!
    • 1.f8R+?
      • 1...Ke6
        • 2.Qf5#
        • 2.Qf7#
      • 1...Kc6!
  • Keys
    • 1.Qd3!
      • 1...Kc6
        • 2.b8S#
      • 1...Ke6
        • 2.f8S#
      • 1...Kxd8
        • 2.Qxd6#
      • 1...d5
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT,XB(G)::P=Q
  • Tries
    • Try
      • Q(F);
      • Threat
        • QAB1(F)
      • Vars
        • P(a);OGATEB::QAR2(F),XP(a)
      • Refutation
        • K(b);P-FLIGHT,XB(G)
    • Try
      • Q(F);CHECK
      • Refutation
        • K(b);P-FLIGHT,XB(G)
    • Try
      • Q(F);
      • Vars
        • K(b);S_FLIGHT::P=S
        • P(a);OGATEB::QAR2(F),XP(a)
      • Refutation
        • K(b);P-FLIGHT,XB(G)
    • Try
      • P(D);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(F)
        • K(b);P-FLIGHT,XB(G)::P=Q
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • P(E);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • P(E);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • P(E);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(F)
        • K(b);S_FLIGHT::QAR1(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • P(E);CHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(F);P_PINP(a)
    • Vars
      • K(b);N_SPINP(a),S_FLIGHT::P=S
      • K(b);P-FLIGHT,XB(G)::QAR2(F),XP(a)
      • P(a);OGATEB::QAR2(F),XP(a)
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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).