MESON Chess Problem Database

Problem Display
PID: 204541 (5B1K/q4p1B/2pR4/2p1kN1n/2p1p3/4Qp2/5rNb/2rb4 w - - 0 1)

Grigoriev, K

64 Shakhmatnoe obozrenie, 1925

5B1K/q4p1B/2pR4/2p1kN1n/2p1p3/4Qp2/5rNb/2rb4

#2

7 + 13

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb8
      • 2.Qxc5#
    • 1...Qa1
      • 2.Qxc5#
    • 1...Qa2
      • 2.Qxc5#
    • 1...Qa4
      • 2.Qxc5#
    • 1...Qa6
      • 2.Qxc5#
    • 1...Qb7
      • 2.Qxc5#
    • 1...Qc7
      • 2.Qxc5#
    • 1...Qd7
      • 2.Qxc5#
    • 1...Qe7
      • 2.Qxc5#
    • 1...Qa8
      • 2.Qxc5#
    • 1...Ra1
      • 2.Qc3#
    • 1...Rb1
      • 2.Qc3#
    • 1...Rc3
      • 2.Qxc3#
    • 1...Bc2
      • 2.Qc3#
    • 1...Sg3
      • 2.Qf4#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Sxc6#
        • 2.Qxe4#
      • 1...cxd4
        • 2.Qxe4#
      • 1...Qb6
        • 2.Qxe4#
      • 1...Qa4
        • 2.Qxe4#
      • 1...Qa6
        • 2.Qxe4#
      • 1...Qb7
        • 2.Qxe4#
      • 1...Qc7
        • 2.Qxe4#
      • 1...Qd7
        • 2.Qxe4#
      • 1...Qa8
        • 2.Qxe4#
      • 1...Re2
        • 2.Sxf3#
        • 2.Sxc6#
      • 1...Bc2
        • 2.Sxc6#
      • 1...Ba4
        • 2.Qxe4#
      • 1...Sg3
        • 2.Sxc6#
        • 2.Qf4#
      • 1...Sf6
        • 2.Sxc6#
        • 2.Qg5#
      • 1...f5
        • 2.Sxc6#
      • 1...Qe7!
    • 1.Sh6?
      • threat
        • 2.Sg4#
        • 2.Qxe4#
      • 1...Rxg2
        • 2.Qxe4#
      • 1...fxg2
        • 2.Qxe4#
      • 1...Qe7
        • 2.Qxc5#
      • 1...Qd7
        • 2.Qxc5#
        • 2.Qxe4#
      • 1...Re2
        • 2.Sg4#
      • 1...Bc2
        • 2.Sg4#
        • 2.Qc3#
      • 1...Sg3
        • 2.Sg4#
        • 2.Qf4#
      • 1...Sf6
        • 2.Qg5#
      • 1...f5!
  • Keys
    • 1.Sfh4!
      • threat
        • 2.Qxe4#
      • 1...Qe7
        • 2.Qxc5#
      • 1...Re2
        • 2.Sxf3#
      • 1...Bc2
        • 2.Qc3#
      • 1...Sg3
        • 2.Qf4#
      • 1...Sf6
        • 2.Qg5#
      • 1...f5
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 12
  • Sets
    • Q(l);N_GUARD,P_PINB(F)::QAR2(B),XP(h)
    • Q(l);N_GUARD::QAR2(B),XP(h)
    • R(a);N_GUARD::QAB(B)
    • R(a);N_GUARD::QAB(B),XR(a)
    • B(b);S_CUTR(a)::QAB(B)
    • S(j);N_GUARD,S_CUTB(d)::QAB1(B)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(h);XS(C)::QAR1(B),XP(g)
        • Q(l);::QAR1(B),XP(g)
        • Q(l);P_PINB(F)::QAR1(B),XP(g)
        • B(b);::S(C),XP(k)
        • B(b);::QAR1(B),XP(g)
        • P(m);::S(C),XP(k)
      • Refutation
        • Q(l);
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);XS(A)::QAR1(B),XP(g)
        • P(e);XS(A)::QAR1(B),XP(g)
        • Q(l);N_GUARD::QAR2(B),XP(h)
        • R(c);::S(C)
        • S(j);S_CUTP(m)::QAR2(B)
      • Refutation
        • P(m);
  • Actual
    • S(C);
    • Threat
      • QAR1(B),XP(g)
    • Vars
      • Q(l);N_GUARD::QAR2(B),XP(h)
      • R(c);N_GUARD,S_CUTB(b)::S(C),XP(e)
      • B(b);S_CUTR(a)::QAB(B)
      • S(j);N_GUARD,S_CUTB(d)::QAB1(B)
      • S(j);S_CUTP(m)::QAR2(B)
      • P(m);N_GUARD,SBLOCK::S(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).