MESON Chess Problem Database

Problem Display
PID: 179027 (qbN4K/R2n4/R1n5/1kp1p3/ppN1B3/8/8/4Q1B1 w - - 0 1)

Jonsson, Nils Gustav Helmer

2nd HM., Magasinet, 1952

qbN4K/R2n4/R1n5/1kp1p3/ppN1B3/8/8/4Q1B1

#2

8 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Sxd6#
    • 1...b3
      • 2.Sa3#
  • Tries
    • 1.Qf1?
      • threat
        • 2.Sa3#
        • 2.S4d6#
      • 1...Bd6
        • 2.Sa3#
        • 2.Sxd6#
      • 1...a3
        • 2.Sxa3#
        • 2.S4d6#
      • 1...b3!
    • 1.Qe2?
      • threat
        • 2.Sa3#
        • 2.S4d6#
      • 1...Bd6
        • 2.Sa3#
        • 2.Sxd6#
      • 1...a3
        • 2.Sxa3#
        • 2.S4d6#
      • 1...b3!
  • Keys
    • 1.Bd3!
      • threat
        • 2.Sa3#
        • 2.S4d6#
      • 1...Bd6
        • 2.Sa3#
        • 2.Sxd6#
      • 1...a3
        • 2.Sxa3#
        • 2.S4d6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • B(i);N_GUARD,P_PINS(G)::S(C),XB(i)
    • P(b);N_GUARD::S(C)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);
  • Actual
    • B(D);
    • Threat
      • DUALS(2)
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