MESON Chess Problem Database

Problem Display
PID: 255850 (3qN3/1Bp3nK/2R5/4p2p/1PN1k3/3r3Q/3P1R2/5b2 w - - 0 1)

Hersom, Donald H

British Chess Magazine, 1933

3qN3/1Bp3nK/2R5/4p2p/1PN1k3/3r3Q/3P1R2/5b2

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Sf6#
    • 1...Qd5
      • 2.Qh4#
    • 1...Rd4
      • 2.Qf3#
    • 1...Rd5
      • 2.Qe3#
  • Tries
    • 1.Scd6+?
      • 1...Kd4
        • 2.Rc4#
      • 1...Qxd6
        • 2.Rc4#
      • 1...Rxd6
        • 2.Rc4#
      • 1...cxd6
        • 2.Rc4#
      • 1...Kd5!
    • 1.Rd6+?
      • 1...Rd5
        • 2.Qe3#
      • 1...c6!
    • 1.Rxc7+?
      • 1...Qd5
        • 2.Qh4#
      • 1...Rd5
        • 2.Qe3#
      • 1...Kd4!
    • 1.Qg4+?
      • 1...Kd5
        • 2.Rc5#
        • 2.Rd6#
        • 2.Rxc7#
      • 1...hxg4!
    • 1.Qf5+?
      • 1...Kd4
        • 2.Qxe5#
      • 1...Kd5
        • 2.Qxe5#
      • 1...Sxf5!
    • 1.Qe3+?
      • 1...Kd5
        • 2.Qxe5#
      • 1...Rxe3!
    • 1.Qh4+?
      • 1...Kd5
        • 2.Rd6#
      • 1...Qxh4!
  • Keys
    • 1.Sb2!
      • threat
        • 2.Rc4#
      • 1...Kd4
        • 2.Rc4#
      • 1...Kd5
        • 2.Rd6#
      • 1...Qd4
        • 2.Sf6#
      • 1...Qd5
        • 2.Qh4#
      • 1...Rd4
        • 2.Qf3#
      • 1...Rd5
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(h);N_GUARD,SBLOCK::S(I)
    • Q(h);N_GUARD,SBLOCK::QAR(C)
    • R(b);N_GUARD,SBLOCK::QAB1(C)
    • R(b);N_GUARD,SBLOCK::QAR1(C)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(c);P-FLIGHT::R1(F)
        • Q(h);XS(E)::B(G)+R(F),DCHECK
        • R(b);XS(E)::B(G)+R(F),DCHECK
        • P(f);XS(E)::B(G)+R(F),DCHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(F);CHECK
      • Vars
        • R(b);P_SPINR(b)::QAR1(C)
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • R(F);CHECK,XP(f)
      • Vars
        • Q(h);P_SPINQ(h)::QAR(C)
        • R(b);P_SPINR(b)::QAR1(C)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • P(e);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(C),XP(d)
        • K(c);P_SPINP(d),S_FLIGHT::QAR1(C),XP(d)
      • Refutation
        • S(g);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::QAR1(C),XP(d)
      • Refutation
        • R(b);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);S_FLIGHT::B(G)+R(F),DCHECK
      • Refutation
        • Q(h);XQ(C)
  • Actual
    • S(E);
    • Threat
      • B(G)+R(F),DCHECK
    • Vars
      • K(c);P-FLIGHT::R1(F)
      • K(c);S_FLIGHT::B(G)+R(F),DCHECK
      • Q(h);N_GUARD,SBLOCK::S(I)
      • Q(h);N_GUARD,SBLOCK::QAR(C)
      • R(b);N_GUARD,SBLOCK::QAB1(C)
      • R(b);N_GUARD,SBLOCK::QAR1(C)
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).