MESON Chess Problem Database

Problem Display
PID: 392 (6bn/B6q/4B2p/pP6/K7/2PkN3/1P1N1pp1/3Q2b1 w - - 0 1)

Chandler, Guy Wills

The Observer, 1941

(First published on Sun Oct 19 1941)

6bn/B6q/4B2p/pP6/K7/2PkN3/1P1N1pp1/3Q2b1

#2

9 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4+
      • 2.Sdc4#
    • 1...Qf5
      • 2.Bxf5#
    • 1...Qc7
      • 2.Bf5#
    • 1...Qg7
      • 2.Bf5#
    • 1...Sg6
      • 2.Bf5#
    • 1...Sf7
      • 2.Bc4#
  • Tries
    • 1.Bg4?
      • threat
        • 2.Be2#
        • 2.Qc2#
        • 2.Qe2#
      • 1...Qe4+
        • 2.Sdc4#
      • 1...Qxa7
        • 2.Qe2#
      • 1...f1Q
        • 2.Qc2#
      • 1...f1B
        • 2.Qc2#
      • 1...Bb3+!
    • 1.Bd5?
      • threat
        • 2.Sb1#
        • 2.Sdf1#
        • 2.Sb3#
        • 2.Sf3#
        • 2.Sdc4#
        • 2.Se4#
      • 1...Qe4+
        • 2.Sdc4#
        • 2.Sxe4#
        • 2.Bxe4#
      • 1...Qxa7
        • 2.Sdf1#
        • 2.Sdc4#
      • 1...f1Q
        • 2.Sdxf1#
      • 1...f1S
        • 2.Sdxf1#
      • 1...f1B
        • 2.Sb1#
        • 2.Sdxf1#
        • 2.Sb3#
        • 2.Sf3#
        • 2.Sdc4#
        • 2.Se4#
      • 1...f1R
        • 2.Sdxf1#
      • 1...Bxd5!
    • 1.Qb1+?
      • 1...Kxd2
        • 2.Qd1#
      • 1...Ke2!
  • Keys
    • 1.Sg4!
      • threat
        • 2.Se5#
      • 1...Qe4+
        • 2.Sc4#
      • 1...Qxa7
        • 2.Bf5#
      • 1...Qf5
        • 2.Bxf5#
      • 1...Qc7
        • 2.Bf5#
      • 1...Qg7
        • 2.Bf5#
      • 1...Bh2
        • 2.Sxf2#
      • 1...Sg6
        • 2.Bf5#
      • 1...Sf7
        • 2.Bc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(g);CHECK,SBLOCK::QAR(A)+S(C)
    • Q(g);N_GUARD::B(H),XQ(g)
    • Q(g);N_GUARD::B(H)
    • S(i);S_CUTQ(g)::B(H)
    • S(i);S_CUTB(h)::B(H)
  • Tries
    • Try
      • B(H);
      • Threat
        • DUALS(3)
      • Vars
        • Q(g);CHECK,SBLOCK::QAR(A)+S(C)
        • Q(g);XB(I)::QAB1(A)
        • P(b);::QAB1(A)
      • Refutation
        • B(h);CHECK
    • Try
      • B(H);
      • Threat
        • DUALS(6)
      • Vars
        • P(b);::QAR(A)+S(C),XQ(b)
        • P(b);::QAR(A)+S(C),XS(b)
        • P(b);::QAR(A)+S(C),XR(b)
      • Refutation
        • B(h);XB(H)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);OGATEB,P-FLIGHT,XS(C)::QAR1(A)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • Q(g);CHECK,SBLOCK::QAR(A)+S(C)
      • Q(g);N_GUARD,XB(I)::B(H)
      • Q(g);N_GUARD::B(H),XQ(g)
      • Q(g);N_GUARD::B(H)
      • B(a);N_GUARD::S(E),XP(b)
      • S(i);S_CUTQ(g)::B(H)
      • S(i);S_CUTB(h)::B(H)
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).