No. 235, February 2009

14001 -

Die Schwalbe 235, February 2009

15+13. Shortest proof game in 15.0 moves

[2b3nr/1ppp3p/1b6/5p2/3k4/4qr2/PPPPPpPP/RNBQKBNR]

14002 -

Die Schwalbe 235, February 2009

3+3. #4 Post factum, retrovolages

[3N3k/2p1pQ2/8/8/8/2K5/8/8]

14003 -

Die Schwalbe 235, February 2009

8+6. -4 & s#1, Proca retractor, anticirce, magic square f2

[3Q4/1B1N4/3Nkb1r/8/4P1b1/4R3/8/R1rqK3]

14004 -

Die Schwalbe 235, February 2009

9+14. Add 2 pawns for #1, Grid chess

[r1bq1r2/ppppp1kp/5n1b/5K2/6n1/4Q3/PPPPPP1P/8]

14005 -

Die Schwalbe 235, February 2009

13+14. Shortest proof game in 9.5 moves (Bichrom chess)

[r1bqkb1r/pppppppp/8/8/5P2/5N2/PPP3PP/RNB1QRK1]

14006 -

Die Schwalbe 235, February 2009

Dedicated to Herbert Ahues' birthday

4+0. White plays 6 moves so that he has a maximal possible moves in the resulting position. How many moves are that?

[8/2P2PP1/8/3R4/8/8/8/8]

14007 -

Die Schwalbe 235, February 2009

Dedicated to Herbert Ahues' birthday

3+3. White and black play 2 moves (white starts). How many possible move combinations are there?

[8/8/8/P6p/2P4k/K3p3/8/8]

14008 -

Die Schwalbe 235, February 2009

Which unique monochromatic proof game ends with 5...BxN#?

14009 -

Die Schwalbe 235, February 2009

Construct a position with only white rooks, in which exactly 45 squares are observed. How many positions are there?