MESON Chess Problem Database

Problem Display
PID: 9643 (3r4/2pPQ1Pq/bb5p/2P3pK/8/1P1k2r1/4R3/B1n3N1 w - - 0 1)

Crum, John

Heathcote, Godfrey

Marble, Murray

Norwich Mercury, 1907

3r4/2pPQ1Pq/bb5p/2P3pK/8/1P1k2r1/4R3/B1n3N1

#2

9 + 10

16 Chess Amateur (The) 1909
56 The Problemist 1937

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Qxe4#
    • 1...Qg8
      • 2.Qe4#
    • 1...Qxg7
      • 2.Qe4#
    • 1...Qh8
      • 2.Qe4#
    • 1...Rxg1
      • 2.Qe3#
    • 1...Rg2
      • 2.Qe3#
    • 1...Re3
      • 2.Qxe3#
    • 1...Rg4
      • 2.Qe3#
    • 1...Rxd7
      • 2.Qxd7#
    • 1...Sxe2
      • 2.Qxe2#
    • 1...c6
      • 2.Qd6#
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qd5#
      • 1...Qg6+
        • 2.Qxg6#
      • 1...Rh3+
        • 2.Qxh3#
      • 1...Qxg7
        • 2.Qf5#
        • 2.Qe4#
      • 1...Rxg1
        • 2.Qe3#
      • 1...Rxd7
        • 2.Qxd7#
      • 1...Bxc5
        • 2.Qxa6#
      • 1...Sxe2
        • 2.Qxe2#
      • 1...Sxb3
        • 2.Qxb3#
      • 1...Qe4
        • 2.Qxe4#
      • 1...Qf5
        • 2.Qxf5#
      • 1...Qg8
        • 2.Qf5#
        • 2.Qe4#
        • 2.Qg6#
      • 1...Rg4
        • 2.Qe3#
      • 1...Bc4
        • 2.Qxc4#
      • 1...Bb7
        • 2.Qc4#
      • 1...c6
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 5
  • Sets
    • Q(i);N_GUARD::QAB1(H),XQ(i)
    • Q(i);N_GUARD::QAB1(H)
    • Q(i);N_GUARD,XP(I)::QAB1(H)
    • R(c);N_GUARD,XS(B)::QAR1(H)
    • R(c);N_GUARD::QAR1(H)
    • R(c);N_GUARD::QAR1(H),XR(c)
    • R(j);OGATE,XP(G)::QAR(H),XR(j)
    • S(a);OGATE,XR(C)::QAB1(H),XS(a)
    • P(h);N_GUARD::QAR(H)
  • Actual
    • Q(H);
    • Threat
      • QAR2(H)
    • Vars
      • Q(i);CHECK,N_GUARD::QAB(H),XQ(i)
      • R(c);CHECK,OGATEB::QAR(H),XR(c)
      • R(c);N_GUARD,XS(B)::QAR1(H)
      • R(j);OGATE,XP(G)::QAR(H),XR(j)
      • B(f);OGATE,XP(E)::QAB(H),XB(e)
      • S(a);OGATE,XR(C)::QAB1(H),XS(a)
      • S(a);OGATE,XP(D)::QAR2(H),XS(a)
      • Q(i);N_GUARD::QAB1(H),XQ(i)
      • Q(i);N_GUARD::QAB(H),XQ(i)
      • R(c);N_GUARD::QAR1(H)
      • B(e);N_GUARD::QAB1(H),XB(e)
      • B(e);N_GUARD::QAB1(H)
      • P(h);N_GUARD::QAR(H)
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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).