MESON Chess Problem Database

Problem Display
PID: 121520 (1N6/r7/8/Bkp5/8/2Q5/8/1K1B4 w - - 0 1)

Mach, Julius Zdenek

Ruch, 1948

1N6/r7/8/Bkp5/8/2Q5/8/1K1B4

#2

5 + 3

6490 yacpdb 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa5
      • 2.Qb3#
    • 1...c4
      • 2.Qb4#
      • 2.Qe5#
  • Tries
    • 1.Be2+?
      • 1...c4
        • 2.Qb4#
      • 1...Ka4!
    • 1.Qa3?
      • threat
        • 2.Qa4#
      • 1...Rxa5
        • 2.Qb3#
      • 1...c4
        • 2.Qb4#
      • 1...Kc4!
    • 1.Qd3+?
      • 1...c4
        • 2.Qf5#
        • 2.Qd5#
      • 1...Kxa5!
    • 1.Qc4+?
      • 1...Kxa5
        • 2.Qxc5#
      • 1...Kxc4!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qa4#
      • 1...Kxa5
        • 2.Qxc5#
      • 1...Rxa5
        • 2.Qb3#
      • 1...c4
        • 2.Qf5#

Anticipated by 224495(1887), 51031(1913), 190141(1913)

This anticipates 224811(2004)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(c);SBLOCK,XB(D)::QAR2(C)
  • Tries
    • Try
      • B(B);CHECK
      • Vars
        • P(b);P_SPINP(b)::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • R(c);SBLOCK,XB(D)::QAR2(C)
        • P(b);N_GUARD::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • K(a);P-FLIGHT,XB(D)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT,XB(D)::QAR2(C),XP(b)
      • Refutation
        • K(a);S_FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • K(a);P-FLIGHT,XB(D)::QAR2(C),XP(b)
      • R(c);SBLOCK,XB(D)::QAR2(C)
      • P(b);OGATEB,SBLOCK::QAR(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).