MESON Chess Problem Database

Problem Display
PID: 82082 (3Nq2b/3N1Rn1/r4p1K/r1nRpkBp/3Pp3/3p4/b7/3Q4 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Die Schwalbe, 1960

3Nq2b/3N1Rn1/r4p1K/r1nRpkBp/3Pp3/3p4/b7/3Q4

#2

8 + 13

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd7
      • 2.Rxe5#
    • 1...Qxd8
      • 2.Rxe5#
    • 1...Qf8
      • 2.Rxe5#
    • 1...Qg8
      • 2.Rxe5#
    • 1...Ra7
      • 2.Rxf6#
    • 1...Ra8
      • 2.Rxf6#
    • 1...Sce6
      • 2.Rxf6#
    • 1...Sge6
      • 2.Rxe5#
    • 1...e3
      • 2.Qf3#
  • Tries
    • 1.Sxe5?
      • threat
        • 2.Qf1#
      • 1...Qxe5
        • 2.Rxe5#
      • 1...e3
        • 2.Qf3#
      • 1...Sce6
        • 2.Rxf6#
      • 1...Sge6
        • 2.Sc4#
      • 1...Qxd8!
    • 1.Qxh5?
      • threat
        • 2.Qh3#
      • 1...e3
        • 2.Qf3#
      • 1...Sxh5!
    • 1.Qh1?
      • threat
        • 2.Qh3#
      • 1...e3
        • 2.Qf3#
      • 1...Kg4!
  • Keys
    • 1.Sxf6!
      • threat
        • 2.Qf1#
      • 1...Rxf6+
        • 2.Rxf6#
      • 1...Qxd8
        • 2.Rxe5#
      • 1...Sce6
        • 2.Sxe8#
      • 1...Sge6
        • 2.Rxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(l);N_GUARD,XS(F)::R1(C),XP(f)
    • Q(l);N_GUARD,XS(H)::R1(C),XP(f)
    • Q(l);N_GUARD::R1(C),XP(f)
    • R(i);N_GUARD::R1(G),XP(j)
    • S(e);S_CUTR(i)::R1(G),XP(j)
    • S(k);S_CUTQ(l)::R1(C),XP(f)
    • P(c);N_GUARD::QAR2(A)
  • Tries
    • Try
      • S(F);P_PINP(j),XP(f)
      • Threat
        • QAR(A)
      • Vars
        • Q(l);OGATE,P_SPINQ(l),XS(F)::R1(C),XQ(l)
        • P(c);N_GUARD::QAR2(A)
        • S(e);S_CUTR(i)::R1(G),XP(j)
        • S(k);S_CUTQ(l)::R(C)+S(F)
      • Refutation
        • Q(l);XS(H)
    • Try
      • Q(A);XP(h)
      • Threat
        • QAB(A)
      • Vars
        • P(c);N_GUARD::QAR2(A)
      • Refutation
        • S(k);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • P(c);N_GUARD::QAR2(A)
      • Refutation
        • K(g);N_SPINP(f),S_FLIGHT
  • Actual
    • S(F);P_SPINS(F),XP(j)
    • Threat
      • QAR(A)
    • Vars
      • R(i);CHECK,OGATE,P_SPINR(i),XS(F)::R1(G),XR(i)
      • Q(l);N_GUARD,XS(H)::R1(C),XP(f)
      • S(e);N_PINS(F)::R(G)+S(F),XQ(l)
      • S(k);N_PINS(F),S_CUTQ(l)::R1(C),XP(f)
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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).