MESON Chess Problem Database

Problem Display
PID: 150130 (6b1/1p2Q2n/1p1pp2K/1p1k4/4RRp1/q6p/5B2/2r4B w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1928

(First published on Sun Oct 21 1928)

6b1/1p2Q2n/1p1pp2K/1p1k4/4RRp1/q6p/5B2/2r4B

#2

6 + 12

14868 Pirnie Collection 2014
15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Rc4#
    • 1...Qb2
      • 2.Re1#
    • 1...Qc5
      • 2.Re1#
    • 1...Qa1
      • 2.Re1#
    • 1...Qa2
      • 2.Re1#
    • 1...Qa5
      • 2.Re1#
    • 1...Qa6
      • 2.Re1#
    • 1...Qa7
      • 2.Re1#
    • 1...Qa8
      • 2.Re1#
    • 1...Ra1
      • 2.Qxb7#
    • 1...Rb1
      • 2.Qxb7#
    • 1...Rd1
      • 2.Qxb7#
    • 1...Re1
      • 2.Qxb7#
    • 1...Rf1
      • 2.Qxb7#
    • 1...Rg1
      • 2.Qxb7#
    • 1...Rxh1
      • 2.Qxb7#
    • 1...Rc5
      • 2.Re3#
    • 1...e5
      • 2.Rxe5#
  • Tries
    • 1.Re2+?
      • 1...Rxh1
        • 2.Qxb7#
      • 1...Qf3!
    • 1.Re3+?
      • 1...Kc5
        • 2.Rxa3#
        • 2.Rb3#
        • 2.Rc3#
        • 2.Rd3#
        • 2.Re5#
        • 2.Qc7#
      • 1...Rxh1!
    • 1.Rd4+?
      • 1...Kc5
        • 2.Rd3#
        • 2.Rc4#
        • 2.Qxd6#
        • 2.Qc7#
      • 1...Ke5!
    • 1.Rxe6+?
      • 1...Qf3
        • 2.Rxd6#
        • 2.Qxd6#
      • 1...Rxh1!
    • 1.Qxd6+?
      • 1...Qxd6
        • 2.Re1#
      • 1...Kxd6!
    • 1.Qxe6+?
      • 1...Kc6
        • 2.Rc4#
      • 1...Bxe6!
  • Keys
    • 1.Bc5!
      • threat
        • 2.Qxd6#
      • 1...Kxc5
        • 2.Re5#
      • 1...Kc6
        • 2.Qxd6#
      • 1...Qxc5
        • 2.Re1#
      • 1...Rxc5
        • 2.Re3#
      • 1...bxc5
        • 2.Qxb7#
      • 1...dxc5
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 15
  • Sets
    • K(f);S_FLIGHT::B(A)+R(C),DCHECK
    • Q(b);N_GUARD::B(A)+R(C)
    • R(a);N_GUARD::QAB(F),XP(j)
    • R(a);N_GUARD,XB(A)::QAB(F),XP(j)
    • R(a);N_GUARD,SBLOCK::B(A)+R(C)
    • P(i);::B(A)+R(C),DCHECK,XP(i)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • R(a);XB(A)::QAB(F),XP(j)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • R(C);CHECK
      • Refutation
        • R(a);XB(A)
    • Try
      • R(C);CHECK
      • Refutation
        • K(f);P-FLIGHT,P_SPINP(i)
    • Try
      • R(C);CHECK,XP(i)
      • Refutation
        • R(a);XB(A)
    • Try
      • Q(F);CHECK,XP(h)
      • Vars
        • Q(b);SBLOCK,XQ(F)::B(A)+R(C)
      • Refutation
        • K(f);P-FLIGHT,XQ(F)
    • Try
      • Q(F);CHECK,XP(i)
      • Vars
        • K(f);P_SPINP(h),S_FLIGHT::B(A)+R(C),DCHECK
      • Refutation
        • B(l);XQ(F)
  • Actual
    • B(B);
    • Threat
      • QAR1(F),XP(h)
    • Vars
      • K(f);P-FLIGHT,P_SPINP(h),XB(B)::R(C)
      • K(f);S_FLIGHT::QAR1(F),XP(h)
      • Q(b);N_GUARD,SBLOCK,XB(B)::B(A)+R(C)
      • R(a);N_GUARD,SBLOCK,XB(B)::B(A)+R(C)
      • P(g);SBLOCK,XB(B)::QAB(F),XP(j)
      • P(h);OGATEB,SBLOCK,XB(B)::QAR2(F)
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).