MESON Chess Problem Database

Problem Display
PID: 9662 (3rQ3/8/b2p4/K2Rq3/1p3rn1/8/1Nn3RN/4k3 w - - 0 1)

Gavrilov, Constantin Grigorievich

1st Prize, Tidskrift for Schack, 1907

3rQ3/8/b2p4/K2Rq3/1p3rn1/8/1Nn3RN/4k3

#2

6 + 9

3360 Simple Two-move Themes 1924
5501 Chess Cameos 1936

SOLUTION

  • SOUND
  • Sets
    • 1...Qe2
      • 2.Rd1#
    • 1...Qe3
      • 2.Rd1#
    • 1...Qe4
      • 2.Rd1#
    • 1...Qe6
      • 2.Rd1#
    • 1...Qe7
      • 2.Rd1#
    • 1...Qxe8
      • 2.Rd1#
    • 1...Bb5
      • 2.Rd1#
  • Tries
    • 1.Qxe5+?
      • 1...Re4
        • 2.Rd1#
      • 1...Be2
        • 2.Rxe2#
        • 2.Rd1#
        • 2.Qxe2#
      • 1...Sce3
        • 2.Rd1#
      • 1...Sge3
        • 2.Rd1#
      • 1...Sxe5
        • 2.Rd1#
      • 1...dxe5!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Rd1#
      • 1...Qxb2
        • 2.Re2#
      • 1...Qxd5
        • 2.Re2#
      • 1...Qd4
        • 2.Re2#
      • 1...Qe2
        • 2.Rxe2#
      • 1...Rd4
        • 2.Sf3#
      • 1...Sce3
        • 2.Re2#
      • 1...Sd4
        • 2.Qxb4#
      • 1...Sf2
        • 2.Rg1#
      • 1...Sge3
        • 2.Re2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 6
  • Sets
    • Q(f);N_PINR(E)::R1(E)
    • Q(f);N_PINR(E),N_SPINQ(f),XQ(F)::R1(E)
    • B(g);N_PINR(E)::R1(E)
  • Tries
    • Try
      • Q(F);CHECK,N_SPINR(E),XQ(f)
      • Vars
        • R(d);P_SPINR(d)::R1(E)
        • S(b);P_SPINS(b)::R1(E)
        • S(e);P_SPINS(e)::R1(E)
        • S(e);XQ(F)::R1(E)
      • Refutation
        • P(h);XQ(F)
  • Actual
    • Q(F);N_PINQ(f),N_SPINR(E)
    • Threat
      • R1(E)
    • Vars
      • Q(f);N_GUARD,XS(A)::R1(B)
      • Q(f);N_GUARD,P_PINQ(F),XR(E)::R1(B)
      • Q(f);N_GUARD::R1(B)
      • Q(f);N_GUARD::R1(B),XQ(f)
      • R(d);N_GUARD::S(C)
      • S(b);S_CUTQ(f)::R1(B)
      • S(b);N_GUARD,S_CUTQ(f),S_CUTR(d)::QAB(F),XP(c)
      • S(e);SBLOCK,S_CUTR(d)::R(B)
      • S(e);S_CUTQ(f)::R1(B)
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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).