MESON Chess Problem Database

Problem Display
PID: 9708 (8/3N3K/2b4p/kBR2p2/1p1Q4/8/8/5q2 w - - 0 1)

Drnek, Josef

Nove parizske mody, 1908

8/3N3K/2b4p/kBR2p2/1p1Q4/8/8/5q2

#2

5 + 6

5424 Versunkene Schatze 1998
3242 BCPS Rapid Solving (Cheltenham) 2001
3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb5
      • 2.Qa1#
    • 1...Qa1
      • 2.Qxa1#
    • 1...Qf4
      • 2.Qa1#
    • 1...b3
      • 2.Qc3#
      • 2.Qd2#
      • 2.Qa4#
  • Tries
    • 1.Bxf1+?
      • 1...Bb5
        • 2.Qa1#
      • 1...Ka4!
    • 1.Bxc6+?
      • 1...Qb5
        • 2.Qa1#
      • 1...Ka6!
    • 1.Qe5?
      • threat
        • 2.Qc7#
      • 1...Qxb5
        • 2.Qa1#
      • 1...b3
        • 2.Qc3#
      • 1...Qf4
        • 2.Qa1#
      • 1...Bxb5!
    • 1.Qf6?
      • threat
        • 2.Qd8#
      • 1...Qxb5
        • 2.Qa1#
      • 1...b3
        • 2.Qc3#
      • 1...Qf4
        • 2.Qa1#
      • 1...Bxb5!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Qd8#
      • 1...Qxb5
        • 2.Qa1#
      • 1...Bxb5
        • 2.Qa8#
      • 1...b3
        • 2.Qc3#
      • 1...Qf4
        • 2.Qa1#

Anticipated by 251231(1901)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(a);N_GUARD,P_SPINQ(a),XB(B)::QAR(A)
    • Q(a);N_GUARD::QAR(A),XQ(a)
    • Q(a);N_GUARD::QAR(A)
  • Tries
    • Try
      • B(B);CHECK,XQ(a)
      • Vars
        • B(e);P_SPINB(e)::QAR(A)
      • Refutation
        • K(c);P-FLIGHT,P_SPINP(b)
    • Try
      • B(B);CHECK,XB(e)
      • Vars
        • Q(a);P_SPINQ(a)::QAR(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a),XB(B)::QAR(A)
        • P(b);OGATEB::QAB(A)
        • Q(a);N_GUARD::QAR(A)
      • Refutation
        • B(e);P_SPINB(e),XB(B)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a),XB(B)::QAR(A)
        • P(b);OGATEB::QAB(A)
        • Q(a);N_GUARD::QAR(A)
      • Refutation
        • B(e);P_SPINB(e),XB(B)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • Q(a);N_GUARD,P_SPINQ(a),XB(B)::QAR(A)
      • B(e);N_GUARD,P_SPINB(e),XB(B)::QAR(A)
      • P(b);OGATEB::QAB(A)
      • Q(a);N_GUARD::QAR(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).