MESON Chess Problem Database

Problem Display
PID: 83528 (2QRb3/6nB/Kn3Rr1/ppB1p2N/2N1k1r1/3p2bp/4p3/4q3 w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1919

2QRb3/6nB/Kn3Rr1/ppB1p2N/2N1k1r1/3p2bp/4p3/4q3

#2

8 + 14

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd2
      • 2.Sxd2#
    • 1...Qf2
      • 2.Sd2#
    • 1...Qa1
      • 2.Sd2#
    • 1...Qb1
      • 2.Sd2#
    • 1...Qf1
      • 2.Sd2#
    • 1...Qg1
      • 2.Sd2#
    • 1...Qh1
      • 2.Sd2#
    • 1...Bf2
      • 2.Qxg4#
    • 1...Bh4
      • 2.Qxg4#
    • 1...Sd5
      • 2.Sd6#
    • 1...Sd7
      • 2.Qb7#
      • 2.Qc6#
      • 2.Qa8#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sxh5
      • 2.Qf5#
  • Tries
    • 1.Sxg3+?
      • 1...Qxg3
        • 2.Sd2#
      • 1...Rxg3!
    • 1.Qb7+?
      • 1...Sd5
        • 2.Sd6#
        • 2.Qxd5#
      • 1...Bc6!
    • 1.Qc6+?
      • 1...Sd5
        • 2.Sd6#
        • 2.Qxd5#
      • 1...Bxc6!
  • Keys
    • 1.Rf2!
      • threat
        • 2.Sf6#
      • 1...Sd5+
        • 2.Sd6#
      • 1...Sd7+
        • 2.Qc6#
      • 1...Qxf2
        • 2.Sd2#
      • 1...Bxf2
        • 2.Qxg4#
      • 1...Sxh5
        • 2.Qf5#
      • 1...Rf4
        • 2.Sxg3#
      • 1...Bh4
        • 2.Qxg4#
      • 1...Sf5
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_GUARD::S(A),XQ(a)
    • Q(a);N_GUARD::S(A)
    • B(d);N_GUARD::QAR2(G),XR(g)
    • S(k);P_PINR(E),SBLOCK::S(A)
    • S(m);N_GUARD,N_SPINR(l)::QAB1(G),XS(m)
    • S(m);N_GUARD,XS(C)::QAB1(G)
  • Tries
    • Try
      • S(C);CHECK,XB(d)
      • Vars
        • Q(a);XS(C)::S(A)
      • Refutation
        • R(g);XS(C)
    • Try
      • Q(G);CHECK
      • Refutation
        • B(n);P_SPINB(n)
    • Try
      • Q(G);CHECK
      • Refutation
        • B(n);XQ(G)
  • Actual
    • R(E);
    • Threat
      • S(C)
    • Vars
      • S(k);CHECK,SBLOCK::S(A)
      • S(k);CHECK,N_GUARD,S_CUTB(n)::QAB(G)
      • Q(a);N_GUARD,XR(E)::S(A)
      • B(d);N_GUARD,XR(E)::QAR2(G),XR(g)
      • S(m);N_GUARD,XS(C)::QAB1(G)
      • R(g);N_GUARD::S(C),XB(d)
      • B(d);N_GUARD::QAR2(G),XR(g)
      • S(m);N_GUARD,N_SPINR(l)::QAB1(G),XS(m)
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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).