MESON Chess Problem Database

Problem Display
PID: 249727 (1B4K1/1B1pp3/6nN/3RrP2/2pR4/1bp2k1N/r3q2Q/8 w - - 0 1)

Knudsen, Birger

Jerusalem Post, 1951

(First published on Fri Mar 30 1951)

1B4K1/1B1pp3/6nN/3RrP2/2pR4/1bp2k1N/r3q2Q/8

#2

9 + 10

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Sg1#
      • 2.Sg5#
      • 2.Qg3#
    • 1...Re4
      • 2.Qg3#
    • 1...Rxd5
      • 2.Qg3#
    • 1...Rxf5
      • 2.Qg3#
    • 1...Re6
      • 2.Qg3#
  • Tries
    • 1.Rd3+?
      • 1...Ke4
        • 2.Sg5#
        • 2.R5d4#
      • 1...Qxd3
        • 2.Rxd3#
      • 1...Qe3
        • 2.Sg5#
      • 1...Re3
        • 2.Sg5#
        • 2.Rd6#
        • 2.Rxd7#
      • 1...cxd3!
    • 1.Rf4+?
      • 1...Sxf4
        • 2.Rd3#
      • 1...Ke3!
    • 1.Rxe5+?
      • 1...d5
        • 2.Sg1#
        • 2.Sg5#
      • 1...Qe4!
  • Keys
    • 1.Rd2!
      • threat
        • 2.R5d3#
      • 1...Ke3
        • 2.Qxe2#
      • 1...Ke4
        • 2.Rxe5#
        • 2.Qxe2#
      • 1...Rxd5
        • 2.Qxe2#
      • 1...Qd3
        • 2.R5xd3#
      • 1...Qe3
        • 2.Qg2#
      • 1...Qe4
        • 2.Qf2#
      • 1...Re3
        • 2.Sg5#
      • 1...Re4
        • 2.Qg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(g);::QAR1(A)
    • R(g);P_SPINR(g),XR(D)::QAR1(A)
    • R(g);XP(E)::QAR1(A)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • Q(b);OGATE,XR(C)::B(G)+R(D),DCHECK,XQ(b)
        • Q(b);P_SPINQ(b)::S(B)
      • Refutation
        • P(f);P_PINR(D),XR(C)
    • Try
      • R(C);CHECK
      • Vars
        • S(h);XR(C)::B(G)+R(D),DCHECK
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • R(D);CHECK,XR(g)
      • Refutation
        • Q(b);P_SPINQ(b)
  • Actual
    • R(C);
    • Threat
      • B(G)+R(D),DCHECK
    • Vars
      • K(e);N_GUARD,P-FLIGHT,S_CUTR(g)::QAR1(A),XQ(b)
      • R(g);N_GUARD,P_SPINR(g),XR(D)::QAB1(A),XQ(b)
      • Q(b);::B(G)+R(D),DCHECK,XQ(b)
      • Q(b);N_GUARD,SBLOCK::QAB1(A)
      • Q(b);N_GUARD,SBLOCK::QAR1(A)
      • R(g);SBLOCK::S(B)
      • R(g);SBLOCK::QAR1(A)
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