MESON Chess Problem Database

Problem Display
PID: 176425 (2R4B/6q1/1Nppp3/4r3/B3P1p1/P1k1PbK1/QNPp2P1/n1br4 w - - 0 1)

Gab, Wolfgang

Schach-Echo, 1983

2R4B/6q1/1Nppp3/4r3/B3P1p1/P1k1PbK1/QNPp2P1/n1br4

#2

12 + 12

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qh6
      • 2.Rxc6#
    • 1...Qf8
      • 2.Rxc6#
    • 1...Qg5
      • 2.Rxc6#
    • 1...Qg6
      • 2.Rxc6#
    • 1...Qa7
      • 2.Rxc6#
    • 1...Qe7
      • 2.Rxc6#
    • 1...Qf7
      • 2.Rxc6#
    • 1...Qh7
      • 2.Rxc6#
    • 1...Qg8
      • 2.Rxc6#
    • 1...Bxb2
      • 2.Qc4#
    • 1...Bxg2
      • 2.Sxd1#
    • 1...Bxe4
      • 2.Sxd1#
    • 1...Sxc2
      • 2.Qb3#
    • 1...Sb3
      • 2.Qxb3#
    • 1...d5
      • 2.Rxc6#
  • Tries
    • 1.Sd5+?
      • 1...exd5
        • 2.Rxc6#
      • 1...Rxd5!
    • 1.Qxa1?
      • threat
        • 2.Sxd1#
      • 1...Re1
        • 2.Sd1#
      • 1...Rf1
        • 2.Sd1#
      • 1...Rg1
        • 2.Sd1#
      • 1...Rh1
        • 2.Sd1#
      • 1...Bxb2!
  • Keys
    • 1.Bxc6!
      • threat
        • 2.S2a4#
      • 1...Kxc2
        • 2.Ba4#
      • 1...Rxe4
        • 2.Bxe4#
      • 1...Bxb2
        • 2.Qc4#
      • 1...Sxc2
        • 2.S6a4#
      • 1...Qa7
        • 2.Bb7#
      • 1...Ra5
        • 2.Bb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 12
  • Sets
    • Q(l);P_SPINR(h)::R(K),XP(i)
    • B(b);SBLOCK,XS(B)::QAR1(A)
    • B(f);N_GUARD,XP(D)::S(B),XR(c)
    • B(f);N_GUARD,XP(I)::S(B),XR(c)
    • S(a);N_GUARD,XP(C)::QAR1(A)
    • S(a);N_GUARD::QAR1(A),XS(a)
    • P(j);S_CUTR(h)::R(K),XP(i)
  • Tries
    • Try
      • S(J);CHECK
      • Vars
        • P(k);XS(J)::R(K),XP(i)
      • Refutation
        • R(h);P_SPINQ(l),XS(J)
    • Try
      • Q(A);XS(a)
      • Threat
        • QAB(A)+S(B),DCHECK,XR(c)
      • Vars
        • R(c);::QAB(A)+S(B),DCHECK
        • R(c);P_PINP(D)::QAB(A)+S(B),DCHECK
      • Refutation
        • B(b);P_SPINB(b),XS(B)
  • Actual
    • B(H);XP(i)
    • Threat
      • S(B)
    • Vars
      • K(e);P-FLIGHT,XP(C)::R(K)+B(H),DCHECK
      • R(h);OGATE,P_SPINQ(l),XP(I)::R(K)+B(H),XR(h)
      • B(b);SBLOCK,XS(B)::QAR1(A)
      • S(a);SBLOCK,XP(C)::S(J)
      • Q(l);N_GUARD,P_SPINR(h)::R(K)+B(H)
      • R(h);N_GUARD,P_SPINQ(l)::R(K)+B(H)
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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).