MESON Chess Problem Database

Problem Display
PID: 110711 (8/1N4p1/2B3K1/3Pk1Pp/4p2p/1n2Q2N/6P1/8 w - - 0 1)

Gruber, Bratoljub

3rd Place, Match: Belgrade - Bucharest, 1957

8/1N4p1/2B3K1/3Pk1Pp/4p2p/1n2Q2N/6P1/8

#2

8 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Qc3#
    • 1...Sc1
      • 2.Qc3#
    • 1...Sd2
      • 2.Qc3#
    • 1...Sd4
      • 2.Qf4#
    • 1...Sa5
      • 2.Qc3#
    • 1...Sc5
      • 2.Qc3#
  • Tries
    • 1.Sf2?
      • threat
        • 2.Sd3#
        • 2.Qxe4#
      • 1...Sc1
        • 2.Qxe4#
      • 1...Sd2
        • 2.Sd3#
      • 1...Sc5!
    • 1.Sd6?
      • threat
        • 2.Sc4#
        • 2.Sf7#
      • 1...Sd2
        • 2.Sf7#
      • 1...Sa5
        • 2.Sf7#
      • 1...Kxd6!
    • 1.Qg1?
      • 1...e3
        • 2.Qxe3#
      • 1...Sa1
        • 2.Qxa1#
      • 1...Sd2
        • 2.Qa1#
      • 1...Sd4
        • 2.Qh2#
      • 1...Sa5
        • 2.Qa1#
      • 1...Sc5
        • 2.Qa1#
      • 1...Sc1!
    • 1.Qd2?
      • 1...e3
        • 2.Qxe3#
      • 1...Sa1
        • 2.Qc3#
        • 2.Qb2#
      • 1...Sc1
        • 2.Qc3#
        • 2.Qb2#
      • 1...Sd4
        • 2.Qf4#
      • 1...Sa5
        • 2.Qc3#
        • 2.Qb2#
      • 1...Sc5
        • 2.Qc3#
        • 2.Qb2#
      • 1...Sxd2!
    • 1.Qf2?
      • 1...e3
        • 2.Qxe3#
        • 2.Qf4#
      • 1...Sa1
        • 2.Qb2#
      • 1...Sc1
        • 2.Qb2#
      • 1...Sd4
        • 2.Qf4#
      • 1...Sa5
        • 2.Qb2#
      • 1...Sc5
        • 2.Qb2#
      • 1...Sd2!
    • 1.Qc5?
      • 1...e3
        • 2.Qxe3#
      • 1...Sa1
        • 2.Qc3#
      • 1...Sc1
        • 2.Qc3#
      • 1...Sd2
        • 2.Qc3#
      • 1...Sd4
        • 2.Qd6#
      • 1...Sa5
        • 2.Qc3#
      • 1...Sxc5!
    • 1.Qa7?
      • 1...Sc5
        • 2.Qa1#
      • 1...e3
        • 2.Qxe3#
      • 1...Sa1
        • 2.Qxa1#
      • 1...Sc1
        • 2.Qa1#
      • 1...Sd2
        • 2.Qa1#
      • 1...Sd4
        • 2.Qb8#
      • 1...Sa5!
    • 1.Qxb3?
      • threat
        • 2.Qb2#
        • 2.Qc3#
      • 1...e3
        • 2.Qxe3#
      • 1...Kd4!
    • 1.g3?
      • 1...Sa1
        • 2.Qc3#
      • 1...Sc1
        • 2.Qc3#
      • 1...Sd2
        • 2.Qc3#
      • 1...Sd4
        • 2.Qf4#
      • 1...Sa5
        • 2.Qc3#
      • 1...Sc5
        • 2.Qc3#
      • 1...hxg3!
  • Keys
    • 1.Qb6!
      • 1...Sc5
        • 2.Qb2#
      • 1...e3
        • 2.Qxe3#
      • 1...Sa1
        • 2.Qb2#
      • 1...Sc1
        • 2.Qb2#
      • 1...Sd2
        • 2.Qb2#
      • 1...Sd4
        • 2.Qc7#
      • 1...Sa5
        • 2.Qb2#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 6
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB(B)
    • S(a);SBLOCK::QAB1(B)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::QAR1(B),XP(b)
        • S(a);::S(C)
      • Refutation
        • S(a);
    • Try
      • S(H);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::S(H)
      • Refutation
        • K(d);N_SPINP(b),S_FLIGHT,XS(H)
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • P(b);OGATEB::QAR2(B),XP(b)
        • S(a);N_GUARD::QAB(B),XS(a)
        • S(a);N_GUARD::QAB(B)
        • S(a);SBLOCK::QAB(B)
      • Refutation
        • S(a);
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • P(b);OGATEB::QAR2(B),XP(b)
        • S(a);SBLOCK::QAB1(B)
      • Refutation
        • S(a);XQ(B)
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • S(a);N_GUARD::QAB(B)
        • S(a);SBLOCK::QAB1(B)
      • Refutation
        • S(a);
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • P(b);OGATEB::QAR2(B),XP(b)
        • S(a);N_GUARD::QAB(B)
        • S(a);SBLOCK::QAB1(B)
      • Refutation
        • S(a);XQ(B)
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • S(a);N_GUARD::QAB(B)
        • P(b);OGATEB::QAR2(B),XP(b)
        • S(a);N_GUARD::QAB(B),XS(a)
        • S(a);SBLOCK::QAB(B)
      • Refutation
        • S(a);
    • Try
      • Q(B);N_PINP(b),XS(a)
      • Threat
        • DUALS(2)
      • Vars
        • P(b);OGATEB::QAR2(B),XP(b)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • P(A);
      • Vars
        • S(a);N_GUARD::QAB(B)
        • S(a);SBLOCK::QAB1(B)
      • Refutation
        • P(c);XP(A)
  • Actual
    • Q(B);N_PINP(b)
    • Vars
      • S(a);OGATE::QAB(B)
      • P(b);OGATEB::QAR2(B),XP(b)
      • S(a);SBLOCK::QAB(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).