MESON Chess Problem Database

Problem Display
PID: 262383 (1Rbn4/pqBN4/B6n/2N5/1k1p4/5Q1R/1P5p/7K w - - 0 1)

Casa, Alex

Savournin, Jacques

Europe Echecs, 1967

1Rbn4/pqBN4/B6n/2N5/1k1p4/5Q1R/1P5p/7K

#2

9 + 8

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5
      • 2.Qb3#
    • 1...Qb6
      • 2.Qa3#
    • 1...Qxb8
      • 2.Qa3#
      • 2.Qb3#
    • 1...Sc6
      • 2.Qa3#
      • 2.Qb3#
    • 1...d3
      • 2.Qe4#
  • Tries
    • 1.Kxh2?
      • threat
        • 2.Qa3#
        • 2.Qb3#
      • 1...Bxd7
        • 2.Qa3#
      • 1...Qb5
        • 2.Qb3#
      • 1...Qb6
        • 2.Qa3#
      • 1...d3
        • 2.Qe4#
        • 2.Qf4#
      • 1...Sg4+!
    • 1.Sd3+?
      • 1...Ka4
        • 2.S7c5#
      • 1...Kb3!
    • 1.Se4?
      • threat
        • 2.Qa3#
        • 2.Qb3#
      • 1...Ka4
        • 2.Qa3#
      • 1...Qb5
        • 2.Qb3#
      • 1...Qb6
        • 2.Qa3#
      • 1...d3!
    • 1.Se5?
      • threat
        • 2.Sed3#
      • 1...Kxc5
        • 2.Sd3#
      • 1...Qb6
        • 2.Qa3#
      • 1...Qb5
        • 2.Rxb5#
        • 2.Qa3#
      • 1...d3
        • 2.Sexd3#
      • 1...Bf5!
    • 1.Rxb7+?
      • 1...Sxb7
        • 2.Qa3#
        • 2.Qb3#
      • 1...Bxb7!
    • 1.Qe4?
      • threat
        • 2.Rb3#
      • 1...Qb5
        • 2.Qxd4#
      • 1...Qb6
        • 2.Qe1#
      • 1...Bxd7!
    • 1.Qd5?
      • threat
        • 2.Rb3#
      • 1...d3
        • 2.Qe4#
      • 1...Qb6!
    • 1.Qxb7+?
      • 1...Sxb7
        • 2.Rb3#
      • 1...Bxb7+!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Rb3#
      • 1...Qb5
        • 2.Qxb5#
      • 1...Qb6
        • 2.Qa4#
      • 1...d3
        • 2.Qe4#

This is after

After Robert Burger.

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(f);N_PINQ(C)::QAR1(C)
    • Q(f);N_PINQ(C)::QAB1(C)
    • P(c);::QAR(C)
  • Tries
    • Try
      • K(A);N_SPINQ(C),P-FLIGHT,XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(g);XS(H)::QAB1(C)
        • Q(f);::QAR1(C)
        • Q(f);::QAB1(C)
      • Refutation
        • S(d);CHECK
    • Try
      • S(E);CHECK
      • Vars
        • K(b);N_SPINQ(f),P-FLIGHT::S(H)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(E);N_SPINQ(C)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);N_SPINQ(f),P-FLIGHT::QAR1(C)
        • Q(f);::QAR1(C)
        • Q(f);::QAB1(C)
      • Refutation
        • P(c);
    • Try
      • S(H);
      • Threat
        • S(H)
      • Vars
        • K(b);N_SPINQ(f),S_FLIGHT,XS(E)::S(H)
        • Q(f);N_PINQ(C)::QAB1(C)
        • P(c);::S(H),XP(c)
      • Refutation
        • B(g);
    • Try
      • R(I);CHECK,N_SPINQ(C),XQ(f)
      • Refutation
        • B(g);P_PINQ(C),XR(I)
    • Try
      • Q(C);P_PINP(c)
      • Threat
        • R1(D)
      • Vars
        • Q(f);N_PINQ(C)::QAR2(C),XP(c)
        • Q(f);N_PINQ(C)::QAB(C)
      • Refutation
        • B(g);XS(H)
    • Try
      • Q(C);
      • Threat
        • R1(D)
      • Vars
        • P(c);::QAR(C)
      • Refutation
        • Q(f);N_PINQ(C)
    • Try
      • Q(C);CHECK,N_SPINQ(C),XQ(f)
      • Vars
        • S(h);P_SPINS(h),XQ(C)::R1(D)
      • Refutation
        • B(g);CHECK,P_SPINB(g),XQ(C)
  • Actual
    • Q(C);
    • Threat
      • R1(D)
    • Vars
      • Q(f);N_PINQ(C)::QAR1(C),XQ(f)
      • Q(f);N_PINQ(C)::QAR1(C)
      • P(c);::QAR(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).