MESON Chess Problem Database

Problem Display
PID: 109413 (8/3pQ3/3R4/1N6/1k6/8/1N6/K7 w - - 0 1)

Sobek, Karel

Straz lidu, 1950

8/3pQ3/3R4/1N6/1k6/8/1N6/K7

#2

5 + 2

6490 yacpdb 2009
5454 Near Snap 2018
3713 Snap 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Sd4?
      • 1...Ka3
        • 2.Ra6#
        • 2.Rxd7#
      • 1...Kc3
        • 2.Qe1#
      • 1...Ka5
        • 2.Qe1#
      • 1...Kc5!
    • 1.Qh4+?
      • 1...Kb3
        • 2.Qa4#
        • 2.Qc4#
      • 1...Ka5
        • 2.Qa4#
      • 1...Kc5
        • 2.Qc4#
      • 1...Kxb5!
    • 1.Qe2?
      • 1...Kb3
        • 2.Qc4#
      • 1...Kc5
        • 2.Qc4#
      • 1...Ka5!
    • 1.Qe3?
      • 1...Kxb5
        • 2.Qb6#
      • 1...Ka5!
    • 1.Qe4+?
      • 1...Kb3
        • 2.Qa4#
        • 2.Qc4#
      • 1...Ka5
        • 2.Qa4#
      • 1...Kc5
        • 2.Qc4#
      • 1...Kxb5!
    • 1.Qe5?
      • 1...Kb3
        • 2.Qc3#
      • 1...Ka5!
  • Keys
    • 1.Sa3!
      • 1...Kxa3
        • 2.Rd3#
      • 1...Kb3
        • 2.Rd3#
      • 1...Kc3
        • 2.Rd3#
      • 1...Ka5
        • 2.Qe1#
      • 1...Kc5
        • 2.Sd3#

Anticipated by 21970(1922)

This anticipates 207652(1991)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Vars
        • K(a);S_FLIGHT::QAB(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(E)
        • K(a);S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,XS(C)
    • Try
      • Q(E);
      • Vars
        • K(a);P-FLIGHT::QAB1(E)
        • K(a);S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);OGATEB,P-FLIGHT,XS(C)::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(E)
        • K(a);S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,XS(C)
    • Try
      • Q(E);
      • Vars
        • K(a);P-FLIGHT::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(C);
    • Vars
      • K(a);S_FLIGHT,XS(C)::QAB(E)+R(D),DCHECK
      • K(a);P-FLIGHT::R(D)
      • K(a);S_FLIGHT::R1(D)
      • K(a);S_FLIGHT::QAB(E)
      • K(a);S_FLIGHT::S(B)
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