MESON Chess Problem Database

Problem Display
PID: 177539 (8/8/8/8/4Q3/6Rq/7k/1K2B2N w - - 0 1)

Jonsson, Christer

Postsjakk, 1967

8/8/8/8/4Q3/6Rq/7k/1K2B2N

#2

5 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qg2
      • 2.Qxg2#
    • 1...Qg4
      • 2.Qg2#
    • 1...Qe6
      • 2.Qg2#
    • 1...Qd7
      • 2.Qg2#
    • 1...Qc8
      • 2.Qg2#
    • 1...Qh4
      • 2.Qg2#
      • 2.Qxh4#
    • 1...Qh5
      • 2.Qg2#
    • 1...Qh6
      • 2.Qg2#
    • 1...Qh7
      • 2.Qxh7#
    • 1...Qh8
      • 2.Qg2#
  • Tries
    • 1.Qc2+?
      • 1...Qg2
        • 2.Qxg2#
      • 1...Kxh1!
    • 1.Qh7?
      • threat
        • 2.Qxh3#
      • 1...Kxh1
        • 2.Qxh3#
      • 1...Qh4
        • 2.Qxh4#
      • 1...Qh5
        • 2.Qxh5#
      • 1...Qh6
        • 2.Qxh6#
      • 1...Qxh7+!
    • 1.Qe2+?
      • 1...Qg2
        • 2.Qxg2#
      • 1...Kxh1!
    • 1.Qh4?
      • threat
        • 2.Qxh3#
      • 1...Kxh1
        • 2.Qxh3#
      • 1...Qxh4!
  • Keys
    • 1.Sf2!
      • 1...Kxg3
        • 2.Sg4#
      • 1...Qxg3
        • 2.Qh1#
      • 1...Qg2
        • 2.Rxg2#
        • 2.Qxg2#
      • 1...Qf1
        • 2.Sg4#
      • 1...Qg4
        • 2.Sxg4#
        • 2.Qg2#
      • 1...Qf5
        • 2.Rg2#
      • 1...Qe6
        • 2.Rg2#
        • 2.Qg2#
      • 1...Qd7
        • 2.Rg2#
        • 2.Qg2#
      • 1...Qc8
        • 2.Rg2#
        • 2.Qg2#
      • 1...Qh4
        • 2.Rg2#
        • 2.Qg2#
        • 2.Qxh4#
      • 1...Qh5
        • 2.Rg2#
        • 2.Qg2#
      • 1...Qh6
        • 2.Sg4#
        • 2.Rg2#
        • 2.Qg2#
      • 1...Qh7
        • 2.Sg4#
        • 2.Rg2#
      • 1...Qh8
        • 2.Sg4#
        • 2.Rg2#
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • Q(b);N_GUARD::QAR1(E),XQ(b)
    • Q(b);N_GUARD::QAR1(E)
    • Q(b);OGATEB,P_PINQ(E)::QAR(E),XQ(b)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAR1(E),XQ(b)
      • Refutation
        • K(a);P-FLIGHT,XS(C)
    • Try
      • Q(E);P_PINQ(b)
      • Threat
        • QAR1(E),XQ(b)
      • Vars
        • K(a);P-FLIGHT,XS(C)::QAR2(E),XQ(b)
        • Q(b);OGATEB::QAR2(E),XQ(b)
        • Q(b);OGATEB::QAR(E),XQ(b)
      • Refutation
        • Q(b);CHECK,N_SPINQ(b),XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAR1(E),XQ(b)
      • Refutation
        • K(a);P-FLIGHT,XS(C)
    • Try
      • Q(E);P_PINQ(b)
      • Threat
        • QAR1(E),XQ(b)
      • Vars
        • K(a);P-FLIGHT,XS(C)::QAR2(E),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XQ(E)
  • Actual
    • S(C);
    • Vars
      • K(a);S_FLIGHT,XR(D)::B(B)+S(C)
      • Q(b);SBLOCK,XR(D)::QAR1(E)
      • Q(b);N_GUARD,P_PINB(B)::S(C)
      • Q(b);N_GUARD,P_PINQ(E)::R1(D)
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