MESON Chess Problem Database

Problem Display
PID: 699 (2Kn4/2PN3B/3R4/1N1P1r2/Q3qr2/P1Bk1P1b/2pP4/4R1b1 w - - 0 1)

Jacobs, Walter William

2nd HM., British Chess Magazine, 1937

2Kn4/2PN3B/3R4/1N1P1r2/Q3qr2/P1Bk1P1b/2pP4/4R1b1

#2

13 + 8

3098 FIDE Album (1914-1944) (I) 1971
56 The Problemist 1980
23 Die Schwalbe 2003
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf3
      • 2.Se5#
    • 1...Qxd5
      • 2.Se5#
    • 1...Qxa4
      • 2.Se5#
    • 1...Qb4
      • 2.Se5#
    • 1...Qc4
      • 2.Se5#
    • 1...Qe5
      • 2.Sxe5#
    • 1...Rxf3
      • 2.Qxe4#
    • 1...Bh2
      • 2.Sc5#
    • 1...Bc5
      • 2.Sxc5#
  • Tries
    • 1.Qc4+?
      • 1...Qxc4
        • 2.Se5#
      • 1...Kxc4!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Sd4#
      • 1...Kc4
        • 2.Sd4#
      • 1...Qxd5
        • 2.Se5#
      • 1...Rxd5
        • 2.Sa7#
      • 1...Qa4
        • 2.Se5#
      • 1...Qb4
        • 2.Se5#
      • 1...Qc4
        • 2.Se5#
      • 1...Qd4
        • 2.Sxd4#
      • 1...Bd4
        • 2.Sxd4#
        • 2.Sa7#

This anticipates 182465(1980)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(e);N_GUARD,P_SPINR(g),XP(E)::S(K)
    • Q(e);N_GUARD,P_SPINQ(e),P_SPINR(g),XP(H)::S(K)
    • Q(e);N_GUARD,P_SPINR(g),XQ(F)::S(K)
    • Q(e);N_GUARD,P_SPINR(g)::S(K)
    • Q(e);N_GUARD,P_PINP(J),P_SPINR(g)::S(K)
    • Q(e);N_GUARD,P_SPINR(g)::S(K),XQ(e)
    • R(f);N_GUARD,XP(E)::QAB1(F),XQ(e)
    • B(a);N_GUARD::S(K)
    • B(a);N_GUARD::S(K),XB(a)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • Q(e);P_PINP(J),P_SPINR(g),XQ(F)::S(K)
      • Refutation
        • K(c);S_FLIGHT,XQ(F)
  • Actual
    • Q(F);
    • Threat
      • QAB(F)+S(G)
    • Vars
      • K(c);S_FLIGHT::QAB(F)+S(G)
      • Q(e);N_GUARD,P_SPINQ(e),P_SPINR(g),XP(H)::S(K)
      • R(g);P_PINS(K),P_SPINQ(e),P_SPINR(g),XP(H)::QAB(F)+S(G)
      • Q(e);N_GUARD,P_SPINR(g)::S(K)
      • Q(e);N_GUARD,P_PINP(J),P_SPINR(g)::S(K)
      • Q(e);P_SPINR(g)::QAB(F)+S(G),XQ(e)
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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).