BBQ: Uitwerking Stelling 8 en 9.

Bij deze de uitwerkingen van Stelling 8 en 9 van de Bukh-Burg Quiz.

###pgn###
[Event “?”]
[Site “?”]
[Date “2012.09.17”]
[Round “?”]
[White “Stelling 8”]
[Black “BBQ”]
[Result “*”]
[Annotator “,Twaburov”]
[SetUp “1”]
[FEN “8/4K3/3R3k/5P2/8/8/8/r7 b – – 0 0”]
[PlyCount “15”]
[SourceDate “2004.06.07”]

1… Kh7 $1 {De enige zet die remise houdt. Cruciaal is om het promotieveld f8
onder controle te houden.} (1… Kg7 $2 {Dit verliest omdat wit met tempo zijn
pion op kan spelen.} 2. f6+ Kh7 3. f7 Ra7+ 4. Rd7 Ra8 5. f8=Q) (1… Kg5 $2 {
Dit verliest omdat de witte koning nu naar g7 kan.} 2. f6 Ra7+ 3. Kf8 Kg6 4.
f7+ Kh7 5. Rf6 Ra8+ 6. Ke7 Ra7+ 7. Ke6 Ra6+ 8. Ke5 Ra5+ 9. Kd4) 2. f6 Ra8 (2…
Ra7+ 3. Rd7 Ra8 4. f7 Kg7) 3. Rd8 Ra7+ 4. Rd7 (4. Ke8 Kg6) 4… Ra8 5. f7 Kg7
6. Rd1 Ra7+ 7. Rd7 Rxd7+ 8. Kxd7 Kxf7 *
%%%pgn%%%

###pgn###
[Event “?”]
[Site “?”]
[Date “2012.09.17”]
[Round “?”]
[White “Stelling 9”]
[Black “BBQ”]
[Result “*”]
[Annotator “,Twaburov”]
[SetUp “1”]
[FEN “8/r2RK2k/5P2/8/8/8/8/8 b – – 0 1”]
[PlyCount “9”]

1… Ra8 $1 {Om het promotieveld te controleren.} (1… Ra1 2. f7 Re1+ {De
enige manier om promotie te stoppen.} 3. Kf8 Re2 {Zwart kan niks doen tegen
wits volgende zetten.} (3… Ra1 4. Ke8 Ra8+ 5. Rd8) 4. Rd3 Re1 5. Rh3+ Kg6 6.
Kg8) 2. f7 (2. Ke6+ Kg8 3. Rc7 Kf8 $11) 2… Kg7 3. Rd4 Ra7+ 4. Rd7 Rxd7+ 5.
Kxd7 Kxf7*
%%%pgn%%%

Stand:
Rob van Meurs, Kees van Oirschot, Mischa Senders, Justin Senders 2 punten
Bert Kramer 1 punt
Bernard Kasteel, Miriam Burg 0 punten

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