MESON Chess Problem Database

Problem Display
PID: 225666 (3Rq3/3r4/BB4N1/KnP1NP2/3k1n2/1P5R/1P1r2p1/4Qbb1 w - - 0 1)

Opalek, Cyril

Praca, 1948

3Rq3/3r4/BB4N1/KnP1NP2/3k1n2/1P5R/1P1r2p1/4Qbb1

#2

12 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5
      • 2.Qxe5#
    • 1...Rd5
      • 2.c6#
    • 1...Sd5
      • 2.Sc6#
  • Tries
    • 1.Sf3+?
      • 1...Kd5
        • 2.Bb7#
      • 1...Kd3!
    • 1.Qe3+?
      • 1...Kd5
        • 2.Sxf4#
        • 2.Bb7#
      • 1...Bxe3!
  • Keys
    • 1.Bb7!
      • threat
        • 2.Qe4#
      • 1...Qxe5
        • 2.Qxe5#
      • 1...Re2
        • 2.Qb4#
      • 1...Rd5
        • 2.c6#
      • 1...Be2
        • 2.Qxg1#
      • 1...Bd3
        • 2.Sf3#
      • 1...Be3
        • 2.Qxe3#
      • 1...Se2
        • 2.Qxd2#
      • 1...Sd5
        • 2.Sc6#
      • 1...Sc3
        • 2.bxc3#
      • 1...Sd6
        • 2.cxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • Q(i);OGATE,XS(G)::QAB1(A),XQ(i)
    • R(h);::B(J)+P(F)
    • S(f);N_SPINR(h),SBLOCK::S(G)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(e);P-FLIGHT::B(I)
      • Refutation
        • K(e);P-FLIGHT,P_SPINS(g)
    • Try
      • Q(A);CHECK
      • Refutation
        • B(b);XQ(A)
  • Actual
    • B(I);
    • Threat
      • QAR1(A)
    • Vars
      • Q(i);OGATE,XS(G)::QAB1(A),XQ(i)
      • R(c);OGATE::QAR2(A)
      • R(h);::B(J)+P(F)
      • B(a);OGATE::QAB(A),XB(b)
      • B(a);SBLOCK::S(G)
      • B(b);N_GUARD::QAB1(A),XB(b)
      • S(f);N_GUARD,S_CUTB(a)::QAR2(A),XR(c)
      • S(f);N_SPINR(h),SBLOCK::S(G)
      • S(g);OGATE::P(B),XS(g)
      • S(g);N_SPINR(h),OGATE::B(J)+P(F),XS(g)
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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).