MESON Chess Problem Database

Problem Display
PID: 120971 (8/8/8/8/8/p7/kN6/bR1QK3 w - - 0 1)

Hellstrom, Ake

Source?, 1934

8/8/8/8/8/p7/kN6/bR1QK3

#2

4 + 3

6490 yacpdb 2009
5454 Near Snap 2011

SOLUTION

  • SOUND
  • Tries
    • 1.Sd3?
      • threat
        • 2.Sb4#
        • 2.Rxa1#
        • 2.Qb3#
      • 1...Bb2
        • 2.Sb4#
      • 1...Bd4
        • 2.Sb4#
        • 2.Qb3#
      • 1...Be5
        • 2.Sb4#
        • 2.Qb3#
      • 1...Bf6
        • 2.Sb4#
        • 2.Qb3#
      • 1...Bg7
        • 2.Sb4#
        • 2.Qb3#
      • 1...Bh8
        • 2.Sb4#
        • 2.Qb3#
      • 1...Bc3+!
    • 1.Sa4?
      • threat
        • 2.Rxa1#
        • 2.Qb3#
      • 1...Bc3+
        • 2.Sxc3#
      • 1...Bd4
        • 2.Qb3#
      • 1...Be5
        • 2.Qb3#
      • 1...Bf6
        • 2.Qb3#
      • 1...Bg7
        • 2.Qb3#
      • 1...Bh8
        • 2.Qb3#
      • 1...Bb2!
  • Keys
    • 1.Rc1!
      • 1...Kxb2
        • 2.Qc2#
      • 1...Bxb2
        • 2.Qd5#
      • 1...axb2
        • 2.Qa4#

This anticipates 91969(1987)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(3)
      • Vars
        • B(a);::S(D)
      • Refutation
        • B(a);CHECK
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK,N_GUARD::S(D),XB(a)
        • B(a);::QAB1(B)
      • Refutation
        • B(a);
  • Actual
    • R(A);
    • Vars
      • K(b);OGATEB,P-FLIGHT,XS(D)::QAR1(B)
      • B(a);SBLOCK,XS(D)::QAB(B)
      • P(c);OGATEB,SBLOCK,XS(D)::QAR2(B)
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