MESON Chess Problem Database

Problem Display
PID: 546 (8/8/6B1/5R2/1bN5/p3p3/2k1p2R/Q6K w - - 0 1)

Macleod, Norman Alasdair

The Observer, 1962

8/8/6B1/5R2/1bN5/p3p3/2k1p2R/Q6K

#2

6 + 5

6455 The Chessboard Adventures of Norman Macleod 1996
3310 2345 Chess Problems 1997
56 The Problemist 2003
5454 Near Snap 2007
56 The Problemist 2007
81 Chess 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Rf4#
      • 2.Rc5#
    • 1...Be1
      • 2.Rb5#
    • 1...Bd2
      • 2.Rb5#
    • 1...Bc3
      • 2.Rb5#
    • 1...Ba5
      • 2.Rb5#
    • 1...Bd6
      • 2.Rb5#
    • 1...Be7
      • 2.Rb5#
    • 1...Bf8
      • 2.Rb5#
  • Tries
    • 1.Sa5?
      • threat
        • 2.Rd5#
      • 1...Kd2
        • 2.Rd5#
      • 1...Kd3
        • 2.Rd5#
      • 1...Bxa5!
    • 1.Qb2+?
      • 1...Kd1
        • 2.Qb1#
      • 1...Kd3
        • 2.Rf4#
        • 2.Rc5#
      • 1...axb2!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Rd5#
      • 1...e1Q+
        • 2.Rf1#
      • 1...e1R+
        • 2.Rf1#
      • 1...Kxd2
        • 2.Rd5#
      • 1...Kd3
        • 2.Rd5#
      • 1...Bxd2
        • 2.Rb5#
      • 1...exd2
        • 2.Rf3#
      • 1...e1S
        • 2.Rc5#

Anticipated by 58089(0000)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 6
  • Sets
    • B(e);::B(F)+R(E)
    • B(e);N_SPINP(b)::B(F)+R(E)
  • Tries
    • Try
      • S(D);
      • Threat
        • B(F)+R(E)
      • Vars
        • K(a);P-FLIGHT::R(E)
        • K(a);N_SPINP(b),S_FLIGHT::B(F)+R(E),DCHECK
      • Refutation
        • B(e);XS(D)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAR2(A)
      • Refutation
        • P(c);XQ(A)
  • Actual
    • S(D);N_PINP(b)
    • Threat
      • B(F)+R(E)
    • Vars
      • P(b);CHECK::B(F)+R(E)
      • K(a);P-FLIGHT,P_SPINP(b),XS(D)::R(E)
      • K(a);S_FLIGHT::B(F)+R(E),DCHECK
      • B(e);SBLOCK,XS(D)::B(F)+R(E)
      • P(d);SBLOCK,XS(D)::B(F)+R(E)
      • P(b);::B(F)+R(E),DCHECK
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).