MESON Chess Problem Database

Problem Display
PID: 269193 (K3N1Q1/5p2/B1p1kPNp/3Rr2r/bn1B2p1/b1Ppp3/8/8 w - - 0 1)

Melvin, Herbert A ('Hamel' or Zaak, HA)

The Observer, 1957

(First published on Sun Nov 24 1957)

K3N1Q1/5p2/B1p1kPNp/3Rr2r/bn1B2p1/b1Ppp3/8/8

#2

9 + 12

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Rxe5#
    • 1...Re4
      • 2.Sc7#
    • 1...Ref5
      • 2.Sc7#
      • 2.Rd6#
    • 1...Reg5
      • 2.Sf4#
      • 2.Sc7#
    • 1...Rhf5
      • 2.Rd6#
    • 1...Sxd5
      • 2.Bc8#
  • Tries
    • 1.Qxf7+?
      • 1...Kf5
        • 2.Rxe5#
      • 1...Kxf7!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Sf4#
      • 1...Kxd5
        • 2.Sf4#
      • 1...Kf5
        • 2.Rxe5#
      • 1...Rxd5
        • 2.Sf8#
      • 1...Sxd5
        • 2.Bc8#
      • 1...cxd5
        • 2.Sf8#
      • 1...fxg6
        • 2.Qd7#
      • 1...Re4
        • 2.Sc7#
      • 1...Ref5
        • 2.Sc7#
        • 2.Rd6#
      • 1...Rhf5
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(j);N_GUARD,N_SPINP(l),P_SPINR(g),S_CUTR(h),S_FLIGHT::R1(C),XR(g)
    • R(g);::S(H)
    • R(h);SBLOCK::R1(C)
    • S(e);SBLOCK,XR(C)::B(D)
  • Tries
    • Try
      • Q(I);CHECK,XP(l)
      • Vars
        • K(j);N_GUARD,P_SPINR(g),S_FLIGHT::R1(C),XR(g)
      • Refutation
        • K(j);S_FLIGHT,XQ(I)
  • Actual
    • Q(I);N_PINP(l)
    • Threat
      • S(F)
    • Vars
      • K(j);S_FLIGHT,XR(C)::S(F)
      • K(j);N_GUARD,P_SPINR(g),S_CUTR(h),S_FLIGHT::R1(C),XR(g)
      • R(g);SBLOCK,XR(C)::S(F)
      • S(e);SBLOCK,XR(C)::B(D)
      • P(i);SBLOCK,XR(C)::S(F)
      • P(l);OGATE,XS(F)::QAB1(I)
      • R(g);::S(H)
      • R(h);SBLOCK::R1(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).