MESON Chess Problem Database

Problem Display
PID: 227770 (R7/b7/3Q4/1kP5/8/1K6/8/8 w - - 0 1)

Schonberger, Tibor

Magyar Sakkvilag, 1926

R7/b7/3Q4/1kP5/8/1K6/8/8

#2

4 + 2

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ka5
      • 2.Qb6#
    • 1...Bxc5
      • 2.Qa6#
    • 1...Bb6
      • 2.Qxb6#
    • 1...Bb8
      • 2.Qb6#
  • Tries
    • 1.Kc3?
      • 1...Ka4
        • 2.Qa6#
      • 1...Bxc5
        • 2.Qa6#
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bb8
        • 2.Qb6#
      • 1...Ka5!
    • 1.Rb8+?
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bxb8
        • 2.Qb6#
      • 1...Ka5!
    • 1.Rc8?
      • 1...Bxc5
        • 2.Rxc5#
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bb8
        • 2.Qb6#
      • 1...Ka5!
    • 1.Qc6+?
      • 1...Ka5
        • 2.Rxa7#
        • 2.Qa4#
        • 2.Qb6#
      • 1...Kxc6!
    • 1.Qe6?
      • 1...Ka5
        • 2.Qb6#
      • 1...Bxc5
        • 2.Qa6#
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bb8
        • 2.Qb6#
      • 1...Kxc5!
    • 1.Qf6?
      • 1...Ka5
        • 2.Qb6#
      • 1...Bxc5
        • 2.Qa6#
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bb8
        • 2.Qb6#
      • 1...Kxc5!
    • 1.Qg6?
      • 1...Ka5
        • 2.Qb6#
      • 1...Bxc5
        • 2.Qa6#
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bb8
        • 2.Qb6#
      • 1...Kxc5!
    • 1.Qh6?
      • 1...Ka5
        • 2.Qb6#
      • 1...Bxc5
        • 2.Qa6#
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bb8
        • 2.Qb6#
      • 1...Kxc5!
    • 1.Qd7+?
      • 1...Ka5
        • 2.Rxa7#
        • 2.Qa4#
      • 1...Ka6
        • 2.Rxa7#
      • 1...Kxc5!
  • Keys
    • 1.Qc7!
      • 1...Ka6
        • 2.Qb6#
      • 1...Bxc5
        • 2.Ra5#
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bb8
        • 2.Ra5#
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • K(a);P-FLIGHT,P_SPINB(b)::QAB1(C)
    • B(b);SBLOCK,XP(B)::QAB1(C)
    • B(b);N_GUARD::QAR1(C),XB(b)
    • B(b);N_GUARD::QAR1(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);P_SPINB(b),S_FLIGHT::QAR2(C)
        • B(b);SBLOCK,XP(B)::QAB1(C)
        • B(b);N_GUARD::QAR1(C),XB(b)
        • B(b);N_GUARD::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,P_SPINB(b)
    • Try
      • R(D);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(C),XB(b)
        • B(b);N_GUARD,XR(D)::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(D);
      • Vars
        • B(b);OGATE,XP(B)::R1(D),XB(b)
        • B(b);N_GUARD::QAR1(C),XB(b)
        • B(b);N_GUARD::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • K(a);S_FLIGHT,XQ(C)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT,P_SPINB(b)::QAB1(C)
        • B(b);SBLOCK,XP(B)::QAB1(C)
        • B(b);N_GUARD::QAR1(C),XB(b)
        • B(b);N_GUARD::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT,P_SPINB(b)::QAB1(C)
        • B(b);SBLOCK,XP(B)::QAB1(C)
        • B(b);N_GUARD::QAR1(C),XB(b)
        • B(b);N_GUARD::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT,P_SPINB(b)::QAB1(C)
        • B(b);SBLOCK,XP(B)::QAB1(C)
        • B(b);N_GUARD::QAR1(C),XB(b)
        • B(b);N_GUARD::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT,P_SPINB(b)::QAB1(C)
        • B(b);SBLOCK,XP(B)::QAB1(C)
        • B(b);N_GUARD::QAR1(C),XB(b)
        • B(b);N_GUARD::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P_SPINB(b),S_FLIGHT::R1(D),XB(b)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
  • Actual
    • Q(C);
    • Vars
      • K(a);P_SPINB(b),S_FLIGHT::QAR1(C)
      • B(b);OGATE,XP(B)::R1(D)
      • B(b);N_GUARD::QAR1(C),XB(b)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).