MESON Chess Problem Database

Problem Display
PID: 287272 (rn4nr/3Rp3/1Nk2q2/pRN2p2/Kp6/8/1p6/3Q3b w - - 0 1)

Nasra, Gabriel G

Riga, C

Die Schwalbe, 1935

rn4nr/3Rp3/1Nk2q2/pRN2p2/Kp6/8/1p6/3Q3b

#2

6 + 12

5454 Near Snap 2026

SOLUTION

  • SOUND
  • Sets
    • 1...Bf3
      • 2.Qxf3#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Sxd7
      • 2.Qxd7#
    • 1...Sh6
      • 2.Qxh1#
    • 1...e6
      • 2.Qd6#
  • Keys
    • 1.Sb7!
      • threat
        • 2.Sd8#
      • 1...Sxd7
        • 2.Qxd7#
      • 1...Qf8
        • 2.Qc2#
      • 1...Sa6
        • 2.Sxa5#
      • 1...Sh6
        • 2.Qxh1#
      • 1...e5
        • 2.Qc2#
      • 1...e6
        • 2.Qd6#

Anticipated by 22043(1923)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::QAB(A),XB(a)
    • B(a);N_GUARD::QAB1(A),XB(a)
    • S(j);OGATE,XR(F)::QAB1(A),XS(j)
    • S(k);S_CUTR(l)::QAB(A),XB(a)
    • P(h);N_GUARD,S_CUTQ(g)::QAR1(A)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • S(j);OGATE,XR(F)::QAB1(A),XS(j)
      • Q(g);N_GUARD::QAR(A)
      • S(j);S_CUTR(i)::S(D),XP(d)
      • S(k);S_CUTR(l)::QAB(A),XB(a)
      • P(h);S_CUTQ(g)::QAR(A)
      • P(h);N_GUARD,S_CUTQ(g)::QAR1(A)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).