Problem 69627

References:

• Valery Smirnov Miniature Moremovers Collection (pgn)

  [Event "?? ??????????-60 2 ???.???."]
  [Site "?"]
  [Date "2002.??.??"]
  [Round "?"]
  [White "I.Dulbergs 4#"]
  [Black "[+0009.00g2a2"]
  [Result "*"]
  [SetUp "1"]
  [FEN "8/8/8/8/8/8/k1NNNNK1/8 w - - 0 1"]
  [PlyCount "7"]
  [EventDate "2002.??.??"]
  
  1. Ned4 Kb2 2. Nde4 Kc1 3. Nd3+ Kb1 4. Nc3# *

• Klaus-Peter Zuncke Miniatures Database (pgn)

  [Event "Uralski problemist "]
  [Site "?"]
  [Date "2003.01.??"]
  [Round "33"]
  [White "Dulbergs,  Imants"]
  [Black "?"]
  [Result "1/2-1/2"]
  [Annotator "4# -6666-"]
  [SetUp "1"]
  [FEN "8/8/8/8/8/8/k1NNNNK1/8 w - - 0 1"]
  [PlyCount "7"]
  [SourceDate "2005.01.01"]
  
  {A12SS16 ASb4  =  Scheltoschko-60  2.eE  .} 1. Ned4 Kb2 2. Nde4 Kc1 3. Nd3+ Kb1
  4. Nc3# 1/2-1/2

• Alexandr Sygurov Collection (pgn)

  [Event "YK V.Zheltonozhko, 2 BV"]
  [Site "?"]
  [Date "2003.??.??"]
  [Round "?"]
  [White "Dulbergs Imants"]
  [Black "?"]
  [Result "*"]
  [SetUp "1"]
  [FEN "8/8/8/8/8/8/k1NNNNK1/8 w - - 0 1"]
  [PlyCount "7"]
  [EventDate "2003.??.??"]
  
  1. Ned4 Kb2 2. Nde4 Kc1 (2... Ka2 3. Nd3 Kb1 4. Nc3#) (2... Kb1 3. Nd3 Ka2 4.
  Nc3#) 3. Nd3+ Kb1 4. Nc3# *