MESON Chess Problem Database

Problem Display
PID: 193997 (8/2N4Q/5P2/k1K5/p7/1p2p3/RP2bp2/8 w - - 0 1)

Laseker, R

Deutsches Wochenschach, 1917

8/2N4Q/5P2/k1K5/p7/1p2p3/RP2bp2/8

#2

6 + 6

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...a3
      • 2.Rxa3#
  • Tries
    • 1.Sb5?
      • threat
        • 2.Qa7#
      • 1...Ka6
        • 2.Rxa4#
        • 2.Qa7#
      • 1...Bxb5!
    • 1.Qd3?
      • threat
        • 2.Qc3#
      • 1...a3
        • 2.Rxa3#
      • 1...Bxd3!
    • 1.Qe4?
      • threat
        • 2.Rxa4#
        • 2.Qxa4#
        • 2.Qb4#
      • 1...bxa2
        • 2.Qb4#
      • 1...Bb5
        • 2.Qb4#
      • 1...a3
        • 2.Rxa3#
        • 2.Qb4#
      • 1...Bc4!
    • 1.Qd7?
      • threat
        • 2.Rxa4#
        • 2.Qxa4#
      • 1...Bb5
        • 2.Qxb5#
      • 1...a3
        • 2.Rxa3#
      • 1...bxa2!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qc3#
      • 1...bxc2
        • 2.b4#
      • 1...a3
        • 2.Rxa3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(e);OGATEB::R(A),XP(e)
  • Tries
    • Try
      • S(E);
      • Threat
        • QAR2(F)
      • Refutation
        • B(a);XS(E)
    • Try
      • Q(F);
      • Threat
        • QAB(F)
      • Vars
        • P(e);OGATEB::R(A),XP(e)
      • Refutation
        • B(a);XQ(F)
    • Try
      • Q(F);
      • Threat
        • DUALS(3)
      • Vars
        • P(c);N_SPINP(e),XR(A)::QAB1(F)
        • B(a);::QAB1(F)
      • Refutation
        • B(a);
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);N_GUARD::QAR1(F),XB(a)
        • P(e);OGATEB::R(A),XP(e)
      • Refutation
        • P(c);N_SPINP(e),XR(A)
  • Actual
    • Q(F);
    • Threat
      • QAB(F)
    • Vars
      • P(c);OGATE,XQ(F)::P(B)
      • P(e);OGATEB::R(A),XP(e)
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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).