MESON Chess Problem Database

Problem Display
PID: 136654 (3K4/bNPQ4/8/3R4/nk2N2p/1p5r/P1pr3p/1Rq1BB2 w - - 0 1)

Langstaff, William A

The Field, 1920

(First published on Thu Feb 12 1920)

3K4/bNPQ4/8/3R4/nk2N2p/1p5r/P1pr3p/1Rq1BB2

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Rb5#
      • 2.Qb5#
    • 1...Be3
      • 2.Rxb3#
    • 1...Sc3
      • 2.Rxb3#
  • Tries
    • 1.Rd4+?
      • 1...Ka3
        • 2.Rxa4#
        • 2.Qxa4#
      • 1...Bxd4!
    • 1.a3+?
      • 1...Qxa3
        • 2.Rb5#
        • 2.Qb5#
      • 1...Kxa3!
  • Keys
    • 1.Ra5!
      • threat
        • 2.Rxa4#
      • 1...Ka3
        • 2.Rxa4#
      • 1...Qa3
        • 2.Rb5#
      • 1...Sb2
        • 2.a3#
      • 1...Sc3
        • 2.Rxb3#
      • 1...Sc5
        • 2.Qd4#
      • 1...Sb6
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • B(j);S_CUTR(f)::R1(A),XP(e)
    • S(g);N_SPINR(c),S_CUTR(f)::R1(A),XP(e)
  • Tries
    • Try
      • R(F);CHECK
      • Refutation
        • B(j);XR(F)
    • Try
      • P(D);CHECK
      • Refutation
        • K(h);N_SPINP(e),N_SPINR(c),S_FLIGHT,XP(D)
  • Actual
    • R(F);P_SPINQ(I)
    • Threat
      • R1(F),XS(g)
    • Vars
      • K(h);N_SPINP(e),N_SPINR(c),P_SPINS(g),S_FLIGHT::R1(F),XS(g)
      • Q(a);SBLOCK::R1(F)
      • S(g);N_SPINP(e),S_CUTQ(a)::P(D)
      • S(g);N_SPINR(c),S_CUTR(f)::R1(A),XP(e)
      • S(g);S_CUTB(j)::QAR2(I)
      • S(g);N_GUARD,S_CUTB(j)::QAB(I)
HTML5 logo

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).