MESON Chess Problem Database

Problem Display
PID: 205535 (8/3K4/8/2pk4/3p4/3Q2N1/8/8 w - - 0 1)

Schonberger, Tibor

L'Echiquier Marseillais, 1925

8/3K4/8/2pk4/3p4/3Q2N1/8/8

#2

3 + 3

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qf5#
    • 1...c4
      • 2.Qf5#
  • Tries
    • 1.Kc7?
      • 1...Ke5
        • 2.Qf5#
      • 1...c4
        • 2.Qf5#
      • 1...Ke6!
    • 1.Sf1?
      • 1...c4
        • 2.Qf5#
      • 1...Ke5!
    • 1.Sh1?
      • 1...c4
        • 2.Qf5#
      • 1...Ke5!
    • 1.Se2?
      • 1...c4
        • 2.Qf5#
        • 2.Qxd4#
      • 1...Ke5!
    • 1.Sf5?
      • 1...c4
        • 2.Qxd4#
      • 1...Ke5!
    • 1.Sh5?
      • 1...c4
        • 2.Qf5#
      • 1...Ke5!
    • 1.Qf1?
      • 1...Ke5
        • 2.Qf5#
      • 1...c4
        • 2.Qf5#
      • 1...d3!
    • 1.Qc2?
      • 1...Ke5
        • 2.Qf5#
      • 1...c4
        • 2.Qf5#
      • 1...d3!
    • 1.Qa6?
      • threat
        • 2.Qe6#
      • 1...Ke5
        • 2.Qd6#
      • 1...c4
        • 2.Qb5#
        • 2.Qa5#
        • 2.Qd6#
      • 1...d3!
    • 1.Qg6?
      • threat
        • 2.Qe6#
      • 1...Ke5
        • 2.Qf5#
        • 2.Qg5#
        • 2.Qd6#
      • 1...d3
        • 2.Qe4#
      • 1...c4
        • 2.Qf5#
        • 2.Qh5#
        • 2.Qg5#
        • 2.Qd6#
      • 1...Kc4!
    • 1.Qh7?
      • 1...Ke5
        • 2.Qf5#
      • 1...d3
        • 2.Qe4#
      • 1...c4
        • 2.Qf5#
        • 2.Qh5#
      • 1...Kc4!
    • 1.Qb3+?
      • 1...c4
        • 2.Qb5#
      • 1...Ke5!
    • 1.Qf3+?
      • 1...Ke5
        • 2.Qf5#
      • 1...Kc4!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qe6#
      • 1...d3
        • 2.Qe4#
      • 1...c4
        • 2.Qh5#

Anticipated by 173725(1925)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(c);N_SPINP(a),P-FLIGHT::QAR1(A)
    • P(b);SBLOCK::QAR2(A)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Vars
        • K(c);N_SPINP(a),P-FLIGHT::QAR1(A)
        • P(b);SBLOCK::QAR2(A)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • S(B);
      • Vars
        • P(b);SBLOCK::QAR2(A)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT
    • Try
      • S(B);
      • Vars
        • P(b);SBLOCK::QAR2(A)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT
    • Try
      • S(B);
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT
    • Try
      • S(B);
      • Vars
        • P(b);N_GUARD::QAR1(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT
    • Try
      • S(B);
      • Vars
        • P(b);SBLOCK::QAR2(A)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
        • P(b);SBLOCK::QAR2(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
        • P(b);SBLOCK::QAR2(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);N_PINP(a)
      • Threat
        • QAB1(A)
      • Vars
        • K(c);P-FLIGHT::QAB1(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);N_PINP(a)
      • Threat
        • QAB1(A)
      • Vars
        • P(a);::QAB1(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
        • P(a);::QAB1(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);CHECK,N_PINP(a)
      • Vars
        • P(b);OGATEB,P_SPINP(b)::QAR2(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);CHECK,N_PINP(a)
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(A);N_PINP(a)
    • Threat
      • QAB1(A)
    • Vars
      • P(a);::QAB1(A)
      • P(b);SBLOCK::QAR(A)
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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).