MESON Chess Problem Database

Problem Display
PID: 142371 (4q3/b2P1rpQ/3n4/1B1p1n2/4k3/2R2N1N/K4p2/3R4 w - - 0 1)

Lane, Henry Fitzgerald William

American Chess Bulletin, 1942

4q3/b2P1rpQ/3n4/1B1p1n2/4k3/2R2N1N/K4p2/3R4

#2

8 + 9

14867 BCPS Library 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Sfg5#
    • 1...Bd4
      • 2.Rxd4#
    • 1...Bb8
      • 2.Rd4#
    • 1...d4
      • 2.Bc6#
  • Tries
    • 1.Qg6?
      • threat
        • 2.Qg4#
      • 1...d4
        • 2.Bc6#
      • 1...Qe5
        • 2.Sfg5#
      • 1...Be3!
    • 1.dxe8Q+?
      • 1...Re7
        • 2.Qxe7#
      • 1...Sxe8!
    • 1.dxe8R+?
      • 1...Re7
        • 2.Rxe7#
      • 1...Sxe8!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Qg4#
      • 1...d4
        • 2.Bc6#
      • 1...Qe5
        • 2.Sfg5#
      • 1...Be3
        • 2.Bd3#
      • 1...Se3
        • 2.Bd3#
      • 1...Sg3
        • 2.Qxd5#
      • 1...Sd4
        • 2.Sd2#
      • 1...Sh4
        • 2.Qxd5#
      • 1...Sh6
        • 2.Qxd5#
      • 1...Se7
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • Q(i);SBLOCK::S(D)
    • B(f);N_GUARD::R1(A),XB(f)
    • B(f);N_GUARD::R1(A)
    • P(c);OGATEB::B(F)
  • Tries
    • Try
      • Q(H);
      • Threat
        • QAR2(H)
      • Vars
        • P(c);OGATEB::B(F)
        • Q(i);SBLOCK::S(D)
      • Refutation
        • B(f);
    • Try
      • P(G);CHECK,XQ(i)
      • Vars
        • R(g);N_GUARD,P_SPINR(g)::QAR(G),XR(g)
      • Refutation
        • S(e);XQ(G)
    • Try
      • P(G);CHECK,XQ(i)
      • Vars
        • R(g);N_GUARD,P_SPINR(g)::R(G),XR(g)
      • Refutation
        • S(e);XR(G)
  • Actual
    • Q(H);N_PINS(d)
    • Threat
      • QAR2(H)
    • Vars
      • P(c);OGATEB::B(F)
      • Q(i);SBLOCK::S(D)
      • B(f);SBLOCK::B(F)
      • S(d);SBLOCK::B(F)
      • S(d);OGATE::QAB1(H),XP(c)
      • S(d);SBLOCK::S(D)
      • S(d);OGATE::QAR1(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).