MESON Chess Problem Database

Problem Display
PID: 258573 (4R3/6b1/1K1p1p2/3k1r2/6Q1/1p4n1/3p4/1B6 w - - 0 1)

Challenger, Alfred Clement

English Mechanic and World of Science, 1895

(First published on Fri Sep 20 1895)

4R3/6b1/1K1p1p2/3k1r2/6Q1/1p4n1/3p4/1B6

#2

4 + 8

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sf1
      • 2.Qe4#
    • 1...Sh1
      • 2.Qe4#
    • 1...Se2
      • 2.Qe4#
    • 1...Se4
      • 2.Qxe4#
    • 1...Sh5
      • 2.Qe4#
    • 1...b2
      • 2.Ba2#
  • Tries
    • 1.Kb5?
      • threat
        • 2.Qc4#
      • 1...Se4
        • 2.Qxe4#
      • 1...Rf4!
    • 1.Bd3?
      • threat
        • 2.Bc4#
        • 2.Qc4#
      • 1...Se4
        • 2.Qxe4#
      • 1...Rf4!
  • Keys
    • 1.Re4!
      • 1...Sxe4
        • 2.Qxe4#
      • 1...d1Q
        • 2.Qxd1#
      • 1...d1S
        • 2.Qxd1#
      • 1...d1B
        • 2.Qxd1#
      • 1...d1R
        • 2.Qxd1#
      • 1...Rf1
        • 2.Qe6#
      • 1...Rf2
        • 2.Qe6#
      • 1...Rf3
        • 2.Qe6#
      • 1...Rf4
        • 2.Qe6#
      • 1...Re5
        • 2.Rd4#
      • 1...Rg5
        • 2.Qe6#
      • 1...Rh5
        • 2.Qe6#
      • 1...Bh6
        • 2.Qg8#
      • 1...Bf8
        • 2.Qg8#
      • 1...Bh8
        • 2.Qg8#
      • 1...Sf1
        • 2.Qxf5#
      • 1...Sh1
        • 2.Qxf5#
      • 1...Se2
        • 2.Qxf5#
      • 1...Sh5
        • 2.Qxf5#
      • 1...b2
        • 2.Ba2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 14
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAB1(B)
    • S(c);N_GUARD::QAB1(B),XS(c)
    • P(b);OGATEB::B(A)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • QAB1(B)
      • Vars
        • S(c);N_GUARD::QAB1(B),XS(c)
      • Refutation
        • R(e);
    • Try
      • B(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);N_GUARD::QAB1(B),XS(c)
      • Refutation
        • R(e);
  • Actual
    • R(D);
    • Vars
      • S(c);OGATE,XR(D)::QAB1(B),XS(c)
      • P(a);OGATEB::QAR(B),XQ(a)
      • P(a);OGATEB::QAR(B),XS(a)
      • P(a);OGATEB::QAR(B),XB(a)
      • P(a);OGATEB::QAR(B),XR(a)
      • R(e);OGATE::QAB1(B)
      • R(e);SBLOCK::R1(D)
      • B(h);OGATE::QAB(B)
      • S(c);N_GUARD::QAR2(B),XR(e)
      • P(b);OGATEB::B(A)
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).