MESON Chess Problem Database

Problem Display
PID: 173725 (8/8/2K5/8/1pk5/2p5/2Q2N2/8 w - - 0 1)

Boros, Sandor

Magyar Sakkvilag, 1925

8/8/2K5/8/1pk5/2p5/2Q2N2/8

#2

3 + 3

6490 yacpdb 2018
5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qe4#
    • 1...b3
      • 2.Qe4#
  • Tries
    • 1.Kb6?
      • 1...Kd4
        • 2.Qe4#
      • 1...b3
        • 2.Qe4#
      • 1...Kd5!
    • 1.Sd1?
      • 1...b3
        • 2.Qe4#
        • 2.Qxc3#
      • 1...Kd4!
    • 1.Sh1?
      • 1...b3
        • 2.Qe4#
      • 1...Kd4!
    • 1.Sh3?
      • 1...b3
        • 2.Qe4#
      • 1...Kd4!
    • 1.Se4?
      • 1...b3
        • 2.Qxc3#
      • 1...Kd4!
    • 1.Sg4?
      • 1...b3
        • 2.Qe4#
      • 1...Kd4!
    • 1.Qb1?
      • 1...Kd4
        • 2.Qe4#
      • 1...b3
        • 2.Qe4#
      • 1...c2!
    • 1.Qf5?
      • threat
        • 2.Qd5#
      • 1...Kd4
        • 2.Qe4#
        • 2.Qf4#
        • 2.Qc5#
      • 1...c2
        • 2.Qd3#
      • 1...b3
        • 2.Qe4#
        • 2.Qg4#
        • 2.Qf4#
        • 2.Qc5#
      • 1...Kb3!
    • 1.Qg6?
      • 1...Kd4
        • 2.Qe4#
      • 1...c2
        • 2.Qd3#
      • 1...b3
        • 2.Qe4#
        • 2.Qg4#
      • 1...Kb3!
    • 1.Qh7?
      • 1...Kd4
        • 2.Qe4#
      • 1...c2
        • 2.Qd3#
      • 1...b3
        • 2.Qe4#
        • 2.Qh4#
      • 1...Kb3!
    • 1.Qa2+?
      • 1...b3
        • 2.Qa4#
      • 1...Kd4!
    • 1.Qe2+?
      • 1...Kd4
        • 2.Qe4#
      • 1...Kb3!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Qd5#
      • 1...c2
        • 2.Qd3#
      • 1...b3
        • 2.Qg4#

This anticipates 205535(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);
      • 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);
      • Vars
        • P(b);SBLOCK::QAR2(A)
      • 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)
      • 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);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).