MESON Chess Problem Database

Problem Display
PID: 150720 (1b6/3K4/p3p2R/4k2r/6b1/1R3pP1/3Q4/1B2r3 w - - 0 1)

Byas, Walter

The Observer, 1938

(First published on Sun Jun 19 1938)

1b6/3K4/p3p2R/4k2r/6b1/1R3pP1/3Q4/1B2r3

#2

6 + 8

14868 Pirnie Collection 2014
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rc1
      • 2.Re3#
    • 1...Rd1
      • 2.Re3#
    • 1...Rf1
      • 2.Re3#
    • 1...Rg1
      • 2.Re3#
    • 1...Reh1
      • 2.Re3#
    • 1...Re3
      • 2.Rxe3#
    • 1...Rf5
      • 2.Rxe6#
    • 1...Bd6
      • 2.Qxd6#
    • 1...Ba7
      • 2.Qd6#
    • 1...a5
      • 2.Rb5#
  • Keys
    • 1.Rd3!
      • threat
        • 2.Qf4#
      • 1...Ke4
        • 2.Re3#
      • 1...Kf5
        • 2.Rd5#
      • 1...Re3
        • 2.Rxe3#
      • 1...Re4
        • 2.Qa5#
      • 1...Rf5
        • 2.Rxe6#
        • 2.Qxe1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • R(a);N_GUARD::R(C)
    • R(a);N_GUARD,P_PINQ(B)::R(C)
    • R(a);N_GUARD::R(C),XR(a)
    • R(e);S_CUTB(c)::R1(E),XP(g)
    • B(h);N_GUARD::QAB1(B),XB(h)
    • B(h);N_GUARD::QAB1(B)
    • P(f);N_GUARD::R(C)
  • Actual
    • R(C);
    • Threat
      • QAB1(B)
    • Vars
      • K(d);P-FLIGHT::B(A)+R(C),DCHECK
      • R(a);N_GUARD::R(C),XR(a)
      • R(a);SBLOCK::QAR(B)
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).