MESON Chess Problem Database

Problem Display
PID: 6790 (b3K3/2BB4/4N3/8/2R5/b3r2k/8/4nNR1 w - - 0 1)

Larsen, Karl Adolf Koefoed

Skakbladet, 1933

b3K3/2BB4/4N3/8/2R5/b3r2k/8/4nNR1

#2

7 + 5

3174 The Two-move Chess Problem Tradition and Development 1966
3310 2345 Chess Problems 1997
23 Die Schwalbe 2006
133 The Problemist Supplement 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Re2
      • 2.Rg3#
    • 1...Rb3
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sg7#
      • 2.Sd8#
      • 2.Sf8#
    • 1...Rc3
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sg7#
      • 2.Sd8#
      • 2.Sf8#
    • 1...Rd3
      • 2.Sg5#
    • 1...Rf3
      • 2.Sg5#
    • 1...Rg3
      • 2.Sg5#
      • 2.Rxg3#
    • 1...Re5
      • 2.Rg3#
    • 1...Rxe6+
      • 2.Bxe6#
    • 1...Be7
      • 2.Sg5#
    • 1...Bf3
      • 2.Rg3#
    • 1...Sg2
      • 2.Rh1#
    • 1...Sf3
      • 2.Rg3#
  • Keys
    • 1.Bd8!
      • threat
        • 2.Rh4#
      • 1...Rxe6+
        • 2.Bxe6#
      • 1...Re4
        • 2.Rg3#
      • 1...Be7
        • 2.Sg5#
      • 1...Be4
        • 2.Sf4#
      • 1...Sg2
        • 2.Rh1#
      • 1...Sf3
        • 2.Rg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(c);N_GUARD::R1(B)
    • R(c);N_PINS(D)::B(F)+S(D),DCHECK
    • R(c);CHECK,OGATE,P_SPINR(c),XS(D)::B(F),XR(c)
    • B(b);N_PINS(D)::B(F)+S(D),DCHECK
    • B(e);S_CUTR(c)::R1(B)
    • S(a);SBLOCK,S_CUTB(e)::R(B)
    • S(a);S_CUTR(c)::R1(B)
  • Actual
    • B(E);
    • Threat
      • R1(C)
    • Vars
      • R(c);CHECK,OGATE,P_SPINR(c),XS(D)::B(F),XR(c)
      • R(c);N_GUARD::R1(B)
      • B(b);N_PINS(D)::B(F)+S(D),DCHECK
      • B(e);N_PINS(D)::B(F)+S(D),DCHECK
      • S(a);SBLOCK,S_CUTB(e)::R(B)
      • S(a);S_CUTR(c)::R1(B)
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