MESON Chess Problem Database

Problem Display
PID: 11106 (6BB/p1p1b3/Q3K3/1n6/1nkq3R/p2N4/2Pp4/8 w - - 0 1)

Karlsson, Borje

1st Prize, Norsk Sjakkblad, 1936

6BB/p1p1b3/Q3K3/1n6/1nkq3R/p2N4/2Pp4/8

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4+
      • 2.Rxe4#
    • 1...Qf4
      • 2.Rxf4#
    • 1...Qg4+
      • 2.Rxg4#
  • Tries
    • 1.Qc6+?
      • 1...Bc5
        • 2.Qxc5#
      • 1...Sxc6!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Qb3#
      • 1...Qe4+
        • 2.Kd7#
      • 1...Qg4+
        • 2.Kxe7#
      • 1...Kc3
        • 2.Qb3#
      • 1...Sc3
        • 2.Rxd4#
      • 1...Sd6
        • 2.Qxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(e);CHECK,OGATEB::R(C),XQ(e)
    • Q(e);OGATEB::R(C),XQ(e)
  • Tries
    • Try
      • Q(D);CHECK,N_PINS(f)
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAR1(D),XB(i)
      • Refutation
        • S(c);XQ(D)
  • Actual
    • Q(D);N_PINS(f),P_PINS(c)
    • Threat
      • QAB1(D)
    • Vars
      • Q(e);CHECK::B(F)+K(E)
      • Q(e);CHECK::B(F)+K(E),XB(i)
      • K(d);N_SPINS(c),P-FLIGHT::QAR1(D)
      • S(f);N_GUARD,SBLOCK::R1(C),XQ(e)
      • S(f);S_CUTB(i)::QAR1(D),XS(c)
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