MESON Chess Problem Database

Problem Display
PID: 115940 (3NN3/8/8/2k5/1rbR4/4B3/8/2Q2B1K w - - 0 1)

Gamage, Frederick

American Chess Bulletin, 1908

3NN3/8/8/2k5/1rbR4/4B3/8/2Q2B1K

#2

7 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rb6
      • 2.Qxc4#
  • Tries
    • 1.Qxc4+?
      • 1...Kb6
        • 2.Rd5#
        • 2.Qc7#
      • 1...Rxc4!
  • Keys
    • 1.Qa3!
      • 1...Bd5+
        • 2.Re4#
      • 1...Kb5
        • 2.Rd5#
      • 1...Kb6
        • 2.Rd5#
      • 1...Bxf1
        • 2.Qxb4#
      • 1...Ba2
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Qxb4#
      • 1...Be2
        • 2.Qxb4#
      • 1...Bb3
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Qxb4#
      • 1...Bd3
        • 2.Qxb4#
      • 1...Bb5
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Qa7#
      • 1...Ba6
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Qxb4#
      • 1...Be6
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Qxb4#
      • 1...Bf7
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Qxb4#
      • 1...Bg8
        • 2.Rd1#
        • 2.Rd2#
        • 2.Rd6#
        • 2.Rd7#
        • 2.Qxb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • R(a);N_GUARD,SBLOCK::QAR1(A),XB(b)
  • Tries
    • Try
      • Q(A);CHECK,XB(b)
      • Refutation
        • R(a);XQ(A)
  • Actual
    • Q(A);N_PINB(b),P_PINR(a)
    • Vars
      • B(b);CHECK,SBLOCK::B(D)+R(E)
      • K(c);N_SPINR(a),P-FLIGHT,P_SPINB(b)::R(E)
      • K(c);N_SPINR(a),S_FLIGHT::B(D)+R(E)
      • B(b);XB(B)::QAB1(A),XR(a)
      • B(b);::QAB1(A),XR(a)
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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).