MESON Chess Problem Database

Problem Display
PID: 2509 (3B1n2/KPpq1nN1/3p4/1B1p4/2pkp3/1R1NpR2/2PP3Q/2b2b2 w - - 0 1)

Loyd, Sam

New York Musical World, 1860

3B1n2/KPpq1nN1/3p4/1B1p4/2pkp3/1R1NpR2/2PP3Q/2b2b2

#2

11 + 12

1679 American Chess Nuts 1868
5206 Sam Loyd and His Chess Problems 1913

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb5
      • 2.Sf5#
    • 1...Qf5
      • 2.Sxf5#
    • 1...Qc6
      • 2.Sf5#
    • 1...Qe8
      • 2.Sf5#
    • 1...Qe7
      • 2.Sf5#
    • 1...Qxd8
      • 2.Sf5#
    • 1...Bb2
      • 2.dxe3#
    • 1...Ba3
      • 2.dxe3#
    • 1...Sg5
      • 2.Bf6#
    • 1...Sh6
      • 2.Bf6#
    • 1...Sh8
      • 2.Bf6#
    • 1...Se6
      • 2.Sf5#
    • 1...exd2
      • 2.c3#
    • 1...e2
      • 2.c3#
    • 1...cxb3
      • 2.c3#
    • 1...c3
      • 2.Rb4#
      • 2.dxc3#
    • 1...exf3
      • 2.Qf4#
  • Keys
    • 1.Qxd6!
      • threat
        • 2.Qc5#
      • 1...Qxb5
        • 2.Sf5#
      • 1...Qxd6
        • 2.Sf5#
      • 1...Bxd3
        • 2.c3#
      • 1...Sxd6
        • 2.Bf6#
      • 1...cxd3
        • 2.Rb4#
        • 2.c3#
      • 1...exd3
        • 2.Rf4#
      • 1...exf3
        • 2.Qf4#
      • 1...cxd6
        • 2.Bb6#
      • 1...Qc6
        • 2.Sf5#
      • 1...Qe7
        • 2.Sf5#
      • 1...Ba3
        • 2.dxe3#
      • 1...Se6
        • 2.Sf5#
      • 1...c5
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 10
  • Sets
    • Q(j);N_GUARD,XB(G)::S(J)
    • Q(j);N_GUARD::S(J),XQ(j)
    • Q(j);N_GUARD::S(J)
    • Q(j);N_GUARD,XB(K)::S(J)
    • B(a);N_GUARD::P(B),XP(c)
    • S(k);N_GUARD::B(K)
    • S(l);S_CUTQ(j)::S(J)
    • P(c);XP(B)::P(A)
    • P(c);::P(A)
    • P(d);XR(D)::P(A)
    • P(f);OGATEB,XR(F)::QAR2(C)
  • Actual
    • Q(C);P_PINP(g),XP(h)
    • Threat
      • QAB1(C)
    • Vars
      • Q(j);N_GUARD,XB(G)::S(J)
      • Q(j);N_GUARD,N_SPINP(g),XQ(C)::S(J)
      • B(b);SBLOCK,XS(E)::P(A)
      • S(k);N_GUARD,N_SPINP(g),XQ(C)::B(K)
      • P(f);OGATEB,XS(E)::R(F)
      • P(f);OGATEB,XR(F)::QAR2(C)
      • P(i);N_SPINP(g),OGATE,P_PINP(I),XQ(C)::B(K)
      • Q(j);N_GUARD::S(J)
      • B(a);N_GUARD::P(B),XP(c)
      • S(l);S_CUTQ(j)::S(J)
      • P(i);P_PINP(I)::QAB1(C),XP(i)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).