MESON Chess Problem Database

Problem Display
PID: 83860 (8/2B5/Qp1R1ppK/1Rr1k3/2b2pP1/b1P5/q1pr1N2/8 w - - 0 1)

Roura, Juan R

Good Companions, 1920

8/2B5/Qp1R1ppK/1Rr1k3/2b2pP1/b1P5/q1pr1N2/8

#2

8 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.cxd4#
    • 1...Bd5
      • 2.Rc6#
    • 1...Be6
      • 2.Rxd2#
      • 2.Rd3#
      • 2.Rd4#
  • Tries
    • 1.Rxc5+?
      • 1...Rd5
        • 2.Rxb6#
        • 2.Rdc6#
      • 1...Bd5
        • 2.Rxb6#
        • 2.Rdc6#
      • 1...bxc5
        • 2.Rxd2#
        • 2.Rd3#
        • 2.Rd4#
      • 1...Bxc5!
    • 1.Rdxb6+?
      • 1...Kd5
        • 2.Qb7#
        • 2.Qa8#
      • 1...Rd6!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Qe4#
      • 1...Rxf2
        • 2.Rdxb6#
      • 1...Re2
        • 2.Rdxb6#
      • 1...Rd4
        • 2.cxd4#
      • 1...Rdd5
        • 2.Qe8#
      • 1...Rcd5
        • 2.Qe8#
      • 1...Bd3
        • 2.Rdxb6#
      • 1...Bd5
        • 2.Rc6#
      • 1...f5
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATE::P(B),XR(c)
    • B(e);N_SPINR(g),SBLOCK,S_CUTR(c)::B(H)+R(F)
  • Tries
    • Try
      • R(D);CHECK,XR(g)
      • Refutation
        • B(d);XR(D)
    • Try
      • R(F);CHECK,XP(i)
      • Refutation
        • R(c);
  • Actual
    • Q(E);
    • Threat
      • QAR1(E)
    • Vars
      • R(c);N_GUARD,XS(A)::B(H)+R(F),XP(i)
      • R(c);N_GUARD::B(H)+R(F),XP(i)
      • R(c);OGATE::P(B),XR(c)
      • R(c);N_SPINR(g),S_CUTB(e)::QAR(E)
      • R(g);S_CUTB(e)::QAR(E)
      • B(e);S_CUTR(c)::B(H)+R(F),XP(i)
      • B(e);N_SPINR(g),SBLOCK,S_CUTR(c)::B(H)+R(F)
      • P(j);OGATEB::QAB(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).