MESON Chess Problem Database

Problem Display
PID: 97192 (8/B1p2N2/1n2B3/1pk5/2pN4/p1Q5/K7/8 w - - 0 1)

Savournin, Jacques

Comm., Problem TT, 1963-1964

8/B1p2N2/1n2B3/1pk5/2pN4/p1Q5/K7/8

#2

6 + 6

6490 yacpdb 2009
5454 Near Snap 2011

SOLUTION

  • SOUND
  • Sets
    • 1...b4
      • 2.Qxc4#
    • 1...c6
      • 2.Sb3#
  • Tries
    • 1.Ka1?
      • 1...b4
        • 2.Qxc4#
      • 1...c6
        • 2.Sb3#
      • 1...a2!
    • 1.Kb1?
      • 1...b4
        • 2.Qxc4#
      • 1...c6
        • 2.Sb3#
      • 1...a2+!
    • 1.Kxa3?
      • 1...c6
        • 2.Sb3#
      • 1...b4+!
    • 1.Sc2?
      • 1...b4
        • 2.Qxc4#
      • 1...c6
        • 2.Qb4#
        • 2.Qd4#
        • 2.Qe5#
        • 2.Qe3#
      • 1...Kc6!
    • 1.Sc6?
      • 1...b4
        • 2.Qxc4#
      • 1...Kxc6!
    • 1.Qa5?
      • 1...c6
        • 2.Bxb6#
      • 1...c3
        • 2.Qxc3#
      • 1...Kxd4!
    • 1.Qg3?
      • 1...Kb4
        • 2.Qxa3#
      • 1...c6
        • 2.Qd6#
      • 1...c3
        • 2.Qxc3#
      • 1...b4
        • 2.Qe5#
      • 1...Kxd4!
  • Keys
    • 1.Qe3!
      • 1...Kb4
        • 2.Qxa3#
      • 1...c6
        • 2.Sc2#
      • 1...c3
        • 2.Qxc3#
      • 1...b4
        • 2.Qe5#

Anticipated by 97013(1956), 110724(1957)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);N_GUARD::QAR1(B),XP(b)
    • P(f);SBLOCK::S(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(c);N_GUARD::QAR1(B),XP(b)
        • P(f);SBLOCK::S(C)
      • Refutation
        • P(a);
    • Try
      • K(A);S_FLIGHT
      • Vars
        • P(c);N_GUARD::QAR1(B),XP(b)
        • P(f);SBLOCK::S(C)
      • Refutation
        • P(a);CHECK
    • Try
      • K(A);P-FLIGHT,XP(a)
      • Vars
        • P(f);SBLOCK::S(C)
      • Refutation
        • P(c);CHECK
    • Try
      • S(C);
      • Vars
        • P(c);N_GUARD::QAR1(B),XP(b)
      • Refutation
        • K(d);N_SPINS(e),P-FLIGHT
    • Try
      • S(C);
      • Vars
        • P(c);N_GUARD::QAR1(B),XP(b)
      • Refutation
        • K(d);N_SPINS(e),P-FLIGHT,XS(C)
    • Try
      • Q(B);N_PINP(b),P_PINP(c)
      • Vars
        • P(f);N_GUARD::B(E),XS(e)
        • P(b);OGATEB::QAR2(B),XP(b)
      • Refutation
        • K(d);N_SPINP(c),S_FLIGHT,XS(C)
    • Try
      • Q(B);N_PINP(b)
      • Vars
        • K(d);N_SPINS(e),S_FLIGHT::QAB1(B),XP(a)
        • P(f);N_GUARD::QAB1(B)
        • P(b);OGATEB::QAR2(B),XP(b)
        • P(c);SBLOCK::QAR2(B)
      • Refutation
        • K(d);S_FLIGHT,XS(C)
  • Actual
    • Q(B);N_PINP(b)
    • Vars
      • K(d);N_SPINS(e),S_FLIGHT::QAB1(B),XP(a)
      • P(f);SBLOCK::QAB(B)+S(C)
      • P(b);OGATEB::QAR2(B),XP(b)
      • P(c);SBLOCK::QAR2(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).