MESON Chess Problem Database

Problem Display
PID: 79937 (8/8/8/p7/kpQ5/2n5/3R4/K7 w - - 0 1)

Asplund, Per Ivan Rune

Norsk Vanforetidsskrift, 1957

8/8/8/p7/kpQ5/2n5/3R4/K7

#2

3 + 4

5454 Near Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Ra2#
    • 1...Sa2
      • 2.Rxa2#
    • 1...Se2
      • 2.Ra2#
    • 1...Se4
      • 2.Ra2#
    • 1...Sd5
      • 2.Ra2#
  • Tries
    • 1.Kb2?
      • 1...Sb1
        • 2.Qc6#
      • 1...Sa2
        • 2.Qc6#
      • 1...Se2
        • 2.Qc6#
      • 1...Se4
        • 2.Qc6#
      • 1...Sb5
        • 2.Qb3#
      • 1...Sd5
        • 2.Qc6#
      • 1...Sd1+!
    • 1.Rb2?
      • 1...Ka3
        • 2.Qb3#
      • 1...Sd1
        • 2.Ra2#
      • 1...Sa2
        • 2.Rxa2#
      • 1...Se2
        • 2.Ra2#
      • 1...Se4
        • 2.Ra2#
      • 1...Sb5
        • 2.Qb3#
      • 1...Sd5
        • 2.Ra2#
      • 1...Sb1!
  • Keys
    • 1.Rd3!
      • 1...Ka3
        • 2.Qa2#
      • 1...Sb1
        • 2.Qc6#
      • 1...Sd1
        • 2.Qc6#
      • 1...Sa2
        • 2.Qc6#
      • 1...Se2
        • 2.Qc6#
      • 1...Se4
        • 2.Qc6#
      • 1...Sb5
        • 2.Qb3#
      • 1...Sd5
        • 2.Qc6#

This anticipates 47188(1992)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 5
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::R(B)
    • S(a);N_GUARD::R(B),XS(a)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • S(a);N_GUARD::QAB(C)
        • S(a);SBLOCK::QAB1(C)
      • Refutation
        • S(a);CHECK
    • Try
      • R(B);
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(C)
        • S(a);N_GUARD::R(B)
        • S(a);N_GUARD::R(B),XS(a)
        • S(a);SBLOCK::QAB1(C)
      • Refutation
        • S(a);
  • Actual
    • R(B);
    • Vars
      • K(b);N_SPINP(c),P-FLIGHT,P_SPINS(a)::QAR1(C)
      • S(a);N_GUARD::QAB(C)
      • S(a);SBLOCK::QAB1(C)
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