MESON Chess Problem Database

Problem Display
PID: 175127 (4rb1N/3B3b/2Q2p1n/4knp1/1p6/1P1P3R/4NP2/1K6 w - - 0 1)

Larsen, ?

320 Danske Skakopgaver, 1902

4rb1N/3B3b/2Q2p1n/4knp1/1p6/1P1P3R/4NP2/1K6

#2

9 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Re6
      • 2.Qxe6#
    • 1...Re7
      • 2.Qc5#
    • 1...Ra8
      • 2.Qe6#
    • 1...Rb8
      • 2.Qe6#
    • 1...Rc8
      • 2.Qe6#
    • 1...Rd8
      • 2.Qe6#
    • 1...Bg6
      • 2.Sxg6#
    • 1...Bg8
      • 2.Sg6#
    • 1...Bc5
      • 2.Qxc5#
    • 1...Bd6
      • 2.Qe4#
    • 1...Be7
      • 2.Qe6#
    • 1...Bg7
      • 2.Qc5#
    • 1...Sd6
      • 2.Qc5#
    • 1...Se7
      • 2.Qe6#
    • 1...Sg4
      • 2.Sf7#
    • 1...Sf7
      • 2.Sxf7#
    • 1...Sg8
      • 2.Sf7#
  • Tries
    • 1.Rxh6?
      • threat
        • 2.Sf7#
      • 1...Re7
        • 2.Qc5#
      • 1...Bg6
        • 2.Sxg6#
      • 1...Bg8
        • 2.Sg6#
      • 1...Sd6
        • 2.Qc5#
      • 1...Sxh6!
    • 1.Qb5+?
      • 1...Bc5
        • 2.Qxc5#
      • 1...Kd6!
  • Keys
    • 1.Rh5!
      • 1...Sd4
        • 2.f4#
      • 1...Re6
        • 2.Qxe6#
      • 1...Re7
        • 2.Qc5#
      • 1...Ra8
        • 2.Qe6#
      • 1...Rb8
        • 2.Qe6#
      • 1...Rc8
        • 2.Qe6#
      • 1...Rd8
        • 2.Qe6#
      • 1...Bg6
        • 2.Sxg6#
      • 1...Bg8
        • 2.Sg6#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Bd6
        • 2.Qe4#
      • 1...Be7
        • 2.Qe6#
      • 1...Bg7
        • 2.Qc5#
      • 1...Se3
        • 2.f4#
      • 1...Sg3
        • 2.f4#
      • 1...Sh4
        • 2.f4#
      • 1...Sd6
        • 2.Qc5#
        • 2.f4#
      • 1...Se7
        • 2.Qe6#
        • 2.f4#
      • 1...Sg7
        • 2.f4#
      • 1...Sg4
        • 2.Sf7#
      • 1...Sf7
        • 2.Sxf7#
      • 1...Sg8
        • 2.Sf7#
      • 1...g4
        • 2.d4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • R(h);N_GUARD::QAR1(G),XR(h)
    • R(h);S_CUTB(i)::QAR2(G)
    • R(h);N_GUARD::QAR1(G)
    • B(g);N_GUARD::S(I),XB(g)
    • B(g);N_GUARD::S(I)
    • B(i);N_GUARD::QAR2(G),XB(i)
    • B(i);SBLOCK::QAR1(G)
    • B(i);S_CUTR(h)::QAR1(G)
    • B(i);N_GUARD::QAR2(G)
    • S(c);P_PINP(E),S_CUTB(i)::QAR2(G)
    • S(c);P_PINP(E),S_CUTR(h)::QAR1(G)
    • S(f);N_GUARD::S(I)
    • S(f);N_GUARD::S(I),XS(f)
  • Tries
    • Try
      • R(F);XS(f)
      • Threat
        • S(I)
      • Vars
        • R(h);S_CUTB(i)::QAR2(G)
        • B(g);N_GUARD::S(I),XB(g)
        • B(g);N_GUARD::S(I)
        • S(c);P_PINP(E),S_CUTB(i)::QAR2(G)
      • Refutation
        • S(c);P_PINP(E),XR(F)
    • Try
      • Q(G);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAR2(G),XB(i)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • R(F);
    • Vars
      • S(c);P_PINP(E),P_SPINP(d)::P(C)
      • R(h);N_GUARD::QAR1(G),XR(h)
      • R(h);S_CUTB(i)::QAR2(G)
      • R(h);N_GUARD::QAR1(G)
      • B(g);N_GUARD::S(I),XB(g)
      • B(g);N_GUARD::S(I)
      • B(i);N_GUARD::QAR2(G),XB(i)
      • B(i);SBLOCK::QAR1(G)
      • B(i);S_CUTR(h)::QAR1(G)
      • B(i);N_GUARD::QAR2(G)
      • S(f);N_GUARD::S(I)
      • S(f);N_GUARD::S(I),XS(f)
      • P(d);P_SPINS(c)::P(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).