MESON Chess Problem Database

Problem Display
PID: 262360 (1q5k/5Q2/7p/4N3/3B1K2/8/8/8 w - - 0 1)

Quijano, A

Europe Echecs, 1985

1q5k/5Q2/7p/4N3/3B1K2/8/8/8

#2

4 + 3

5454 Near Snap 2022
3713 Snap 2022
6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5+
      • 2.Bxe5#
    • 1...Qa7
      • 2.Sg6#
    • 1...Qb1
      • 2.Sd3#
      • 2.Sf3#
      • 2.Sc4#
      • 2.Sg4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sd7#
    • 1...Qb2
      • 2.Sg6#
    • 1...Qb3
      • 2.Sd3#
      • 2.Sf3#
      • 2.Sc4#
      • 2.Sg4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sd7#
    • 1...Qb4
      • 2.Sc4#
      • 2.Sg6#
    • 1...Qb5
      • 2.Sg6#
    • 1...Qb6
      • 2.Sg6#
    • 1...Qb7
      • 2.Sd3#
      • 2.Sf3#
      • 2.Sc4#
      • 2.Sg4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sd7#
    • 1...Qa8
      • 2.Sd3#
      • 2.Sf3#
      • 2.Sc4#
      • 2.Sg4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sd7#
    • 1...Qc8
      • 2.Sd3#
      • 2.Sf3#
      • 2.Sc4#
      • 2.Sg4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sd7#
    • 1...Qd8
      • 2.Sg6#
    • 1...Qe8
      • 2.Sg6#
    • 1...Qf8
      • 2.Sg6#
    • 1...Qg8
      • 2.Sg6#
  • Tries
    • 1.Ke3?
      • threat
        • 2.Sg6#
      • 1...Qxe5+
        • 2.Bxe5#
      • 1...Qb3+
        • 2.Sd3#
      • 1...Qe8!
    • 1.Ke4?
      • threat
        • 2.Sg6#
      • 1...Qxe5+
        • 2.Bxe5#
      • 1...Qb1+
        • 2.Sd3#
      • 1...Qb7+
        • 2.Sc6#
      • 1...Qa8+
        • 2.Sc6#
      • 1...Qe8!
    • 1.Kg4?
      • threat
        • 2.Sg6#
      • 1...Qc8+
        • 2.Sd7#
      • 1...Qxe5
        • 2.Bxe5#
      • 1...h5+!
    • 1.Kf5?
      • threat
        • 2.Sg6#
      • 1...Qxe5+
        • 2.Bxe5#
      • 1...Qb1+
        • 2.Sd3#
      • 1...Qc8+
        • 2.Sd7#
      • 1...Qb5!
  • Keys
    • 1.Kf3!
      • threat
        • 2.Sg6#
      • 1...Qb3+
        • 2.Sd3#
      • 1...Qb7+
        • 2.Sc6#
      • 1...Qa8+
        • 2.Sc6#
      • 1...Qxe5
        • 2.Bxe5#

Anticipated by 79250(1962), 23549(1971)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(b);CHECK,OGATE,P_SPINQ(b),XS(C)::B(A),XQ(b)
    • Q(b);N_PINS(C)::B(A)+S(C),DCHECK
    • Q(b);N_PINS(C),P_PINQ(D)::B(A)+S(C),DCHECK
  • Tries
    • Try
      • K(B);N_SPINS(C),S_FLIGHT
      • Threat
        • B(A)+S(C),DCHECK
      • Vars
        • Q(b);CHECK,OGATE,P_SPINQ(b),XS(C)::B(A),XQ(b)
        • Q(b);CHECK,N_GUARD::B(A)+S(C)
      • Refutation
        • Q(b);P_PINS(C)
    • Try
      • K(B);N_SPINS(C),P-FLIGHT
      • Threat
        • B(A)+S(C),DCHECK
      • Vars
        • Q(b);CHECK,OGATE,P_SPINQ(b),XS(C)::B(A),XQ(b)
        • Q(b);CHECK,N_GUARD::B(A)+S(C)
        • Q(b);CHECK,N_GUARD,SBLOCK::B(A)+S(C)
      • Refutation
        • Q(b);P_PINS(C)
    • Try
      • K(B);N_SPINS(C),P-FLIGHT
      • Threat
        • B(A)+S(C),DCHECK
      • Vars
        • Q(b);CHECK,N_GUARD::B(A)+S(C)
        • Q(b);OGATE,P_SPINQ(b),XS(C)::B(A),XQ(b)
      • Refutation
        • P(a);CHECK
    • Try
      • K(B);N_SPINS(C),P-FLIGHT
      • Threat
        • B(A)+S(C),DCHECK
      • Vars
        • Q(b);CHECK,OGATE,P_SPINQ(b),XS(C)::B(A),XQ(b)
        • Q(b);CHECK,N_GUARD::B(A)+S(C)
      • Refutation
        • Q(b);P_PINS(C)
  • Actual
    • K(B);N_SPINS(C),P-FLIGHT
    • Threat
      • B(A)+S(C),DCHECK
    • Vars
      • Q(b);CHECK,N_GUARD::B(A)+S(C)
      • Q(b);CHECK,N_GUARD,SBLOCK::B(A)+S(C)
      • Q(b);OGATE,P_SPINQ(b),XS(C)::B(A),XQ(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).