MESON Chess Problem Database

Problem Display
PID: 250039 (8/2n1n3/8/4q3/1pk1N1Q1/P1N2R2/P4B2/2R1K3 w - - 0 1)

Grigoriev, K

2nd Prize, L'Italia Scacchistica, 1927

8/2n1n3/8/4q3/1pk1N1Q1/P1N2R2/P4B2/2R1K3

#2

9 + 5

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.Sd2#
      • 2.Sg3#
      • 2.Sd6#
    • 1...Qxc3+
      • 2.Sxc3#
    • 1...Qg3
      • 2.Sd2#
      • 2.Sxg3#
      • 2.Sd6#
    • 1...Qf4
      • 2.Sd2#
      • 2.Sd6#
    • 1...Qd6
      • 2.Sd2#
      • 2.Sxd6#
    • 1...Qf6
      • 2.Sd2#
      • 2.Sd6#
      • 2.Sxf6#
    • 1...Qg7
      • 2.Sd2#
      • 2.Sd6#
    • 1...Qh8
      • 2.Sd2#
      • 2.Sd6#
      • 2.Sf6#
    • 1...Qxe4+
      • 2.Qxe4#
    • 1...Qa5
      • 2.Sd2#
      • 2.Sg3#
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sd6#
      • 2.Sf6#
    • 1...Qb5
      • 2.Sd2#
      • 2.Sg3#
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sd6#
      • 2.Sf6#
    • 1...Qc5
      • 2.Sd2#
      • 2.Sxc5#
      • 2.Sd6#
    • 1...Qd5
      • 2.Sd2#
      • 2.Sd6#
    • 1...Qf5
      • 2.Sd2#
      • 2.Sd6#
    • 1...Qg5
      • 2.Sd2#
      • 2.Sxg5#
      • 2.Sd6#
    • 1...Qh5
      • 2.Sd2#
      • 2.Sd6#
  • Tries
    • 1.Sb1+?
      • 1...Kd5
        • 2.Rc5#
      • 1...Qc3+
        • 2.Sexc3#
      • 1...Kb5!
    • 1.Sd1+?
      • 1...Kd5
        • 2.Rc5#
      • 1...Qc3+
        • 2.Sexc3#
      • 1...Kb5!
    • 1.Se2+?
      • 1...Kd5
        • 2.Rc5#
      • 1...Qc3+
        • 2.S4xc3#
      • 1...Kb5!
    • 1.Sa4+?
      • 1...Kd5
        • 2.Sb6#
        • 2.Rc5#
      • 1...Qc3+
        • 2.Sexc3#
      • 1...Kb5!
    • 1.Sb5+?
      • 1...Kd5
        • 2.Rc5#
      • 1...Qc3+
        • 2.Sexc3#
      • 1...Kxb5!
    • 1.Sd5+?
      • 1...Kxd5
        • 2.Rc5#
      • 1...Qc3+
        • 2.Sexc3#
      • 1...Kb5!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qd3#
      • 1...Qxc3+
        • 2.Sd2#
      • 1...Qxe4+
        • 2.Sxe4#
      • 1...bxa3
        • 2.Qa4#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qd6
        • 2.Sxd6#
      • 1...Qd5
        • 2.Sb1#
        • 2.Sd1#
        • 2.Se2#
        • 2.Sa4#
        • 2.Sb5#
        • 2.Sxd5#
      • 1...Scd5
        • 2.Qb5#
      • 1...Sed5
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • Q(c);CHECK,N_PINS(H),P_SPINQ(c),XS(F)::QAR(I)+S(H),XQ(c)
    • Q(c);CHECK,OGATE,P_SPINQ(c),XS(H)::QAR2(I),XQ(c)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::R1(A)
        • Q(c);CHECK,N_PINS(H),P_SPINQ(c)::QAR(I)+S(H),XQ(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::R1(A)
        • Q(c);CHECK,N_PINS(H),P_SPINQ(c)::QAR(I)+S(H),XQ(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(F);CHECK,N_SPINS(H)
      • Vars
        • K(b);OGATE,S_FLIGHT::R1(A)
        • Q(c);CHECK,N_GUARD,P_SPINQ(c)::QAR(I)+S(H),XQ(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • Q(c);CHECK,N_PINS(H),P_SPINQ(c)::QAR(I)+S(H),XQ(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::R1(A)
        • Q(c);CHECK,N_PINS(H),P_SPINQ(c)::QAR(I)+S(H),XQ(c)
      • Refutation
        • K(b);S_FLIGHT,XS(F)
    • Try
      • S(F);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT,XS(F)::R1(A)
        • Q(c);CHECK,N_PINS(H),P_SPINQ(c)::QAR(I)+S(H),XQ(c)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • Q(c);CHECK,N_PINS(H),P_SPINQ(c),XS(F)::S(H)
      • Q(c);CHECK,XS(H)::R(A)+S(F),XQ(c)
      • P(a);OGATEB,XP(E)::QAR2(I)
      • Q(c);N_GUARD,N_PINS(H)::QAR1(I),XQ(c)
      • Q(c);N_PINS(H)::S(H),XQ(c)
      • S(d);N_GUARD,S_CUTQ(c)::QAB1(I)
      • S(e);N_GUARD,S_CUTQ(c)::QAR2(I)
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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).