MESON Chess Problem Database

Problem Display
PID: 98313 (4B1K1/4p3/4Np2/3n1p2/R2bb2k/1r5P/2n3RP/5QN1 w - - 0 1)

May, Willy Paul

Problem (Zagreb), 1951

4B1K1/4p3/4Np2/3n1p2/R2bb2k/1r5P/2n3RP/5QN1

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rg3+
      • 2.hxg3#
    • 1...Bc3
      • 2.Qf2#
    • 1...Bd3
      • 2.Qf2#
    • 1...Bf3
      • 2.Qf2#
    • 1...Sce3
      • 2.Qe1#
      • 2.Qf2#
    • 1...Sc3
      • 2.Qf4#
    • 1...Sde3
      • 2.Qf2#
    • 1...Sb4
      • 2.Qf4#
    • 1...Sf4
      • 2.Qxf4#
    • 1...Sb6
      • 2.Qf4#
    • 1...Sc7
      • 2.Qf4#
    • 1...f4
      • 2.Rg4#
  • Tries
    • 1.Rg5?
      • threat
        • 2.Rh5#
      • 1...Rxh3
        • 2.Qxh3#
      • 1...Rg3
        • 2.hxg3#
      • 1...Bf3
        • 2.Qf2#
      • 1...Sf4
        • 2.Qxf4#
      • 1...fxg5!
    • 1.Qf2+?
      • 1...Rg3+
        • 2.Qxg3#
        • 2.hxg3#
      • 1...Bxf2!
  • Keys
    • 1.Rg7!
      • threat
        • 2.Rh7#
      • 1...Rxh3
        • 2.Qxh3#
      • 1...Rg3
        • 2.hxg3#
      • 1...Be3
        • 2.Sf3#
      • 1...Bf3
        • 2.Qf2#
      • 1...Sf4
        • 2.Qxf4#
      • 1...f4
        • 2.Rg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • R(b);CHECK,OGATE::P(D),XR(b)
    • B(c);N_GUARD,P_SPINB(d),S_CUTR(b)::QAB(A)
    • B(d);P_SPINB(c),S_CUTR(b)::QAB(A)
    • S(f);N_GUARD::QAR2(A)
    • S(f);S_CUTB(c),S_CUTR(b)::QAB(A)
    • S(f);N_GUARD::QAR2(A),XS(f)
    • P(g);N_GUARD::R1(C)
  • Tries
    • Try
      • R(C);
      • Threat
        • R1(C)
      • Vars
        • R(b);OGATE,XP(E)::QAR1(A),XR(b)
        • R(b);OGATE,P_PINR(C)::P(D),XR(b)
        • B(d);P_SPINB(c),S_CUTR(b)::QAB(A)
        • S(f);N_GUARD::QAR2(A),XS(f)
      • Refutation
        • P(h);XR(C)
    • Try
      • Q(A);CHECK
      • Refutation
        • B(c);P_SPINB(d),XQ(A)
  • Actual
    • R(C);
    • Threat
      • R(C)
    • Vars
      • R(b);OGATE,XP(E)::QAR1(A),XR(b)
      • R(b);OGATE,P_PINR(C)::P(D),XR(b)
      • B(c);P_SPINB(d),S_CUTR(b)::S(B)
      • B(d);P_SPINB(c),S_CUTR(b)::QAB(A)
      • S(f);N_GUARD::QAR2(A),XS(f)
      • P(g);N_GUARD::R1(C)
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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).