Tips on Third File Rook

Case 3. Against 42Bishop & 53Silver tactics
This is last case of Koyan Style against Static Rook Bear-in-the-Hole.

(Please note that there are another Koyan Style against Static Rook's quick attack and Static Rook with Mino Castle. I will introduce these tactics some day in the future.)

Fig.1 shows a situation that white moves his Bishop from 3c to 4b in order to prevent from fork by Knight.
(Another move to prevent from fork is P-4d, that means Case 2.)

In this case, static rook player tend to move his 2 Golds to 3a and 3b, while black should make own position better.

The keys of this Koyan style are:

• Aims four general mino castle with 4th file vanguard Pawn.
• Attacks from 3rd file and edge (Please refer to Figure 2). Central attack might not work well due to defence by 64Silver.

Take a look at an example below:

Case 2. Against 44Pawn tactics
The keys of this Koyan style are:

• Attacks from 4e.
• Aims four general mino castle with 4th file vanguard Pawn

44Pawn tactics is used when Static Rook Player aims to castle Bear-in-Hole safely. 44Pawn defends 11 King from diagonal line of opposite Bishop.

Koyan style allow to castle Bear-in-Hole.
Instead, this style attacks from 4e and then makes own mino castle more extensive and offensive.

Take a look at an example below:

Koyan Style is a series of countermeasures against Static Rook Bear-in-the-Hole tactics.
The common aim of all Koyan Style forms is, not to allow Static Rook to castle Four generals Bear-in-the-Hole, unlike Manabe Style.

The style name is derived from a nickname for Isao Nakata (7 dan), who is a professional shogi player using the style uniquely in current professional Shogi world.

Case 1. Against 33bishop + 64silver tactics
The keys are:

• Right knight is on 37.
• Pawn in 4th file is not on 45, but 46.
• Aims counterattack by using right knight
  

White obviously aims quick attack by using right silver.
Black's central attack doesn't work on Figure 1 due to the deffence by right silver on 64.
(On the other hand, the central attack of Manabe Style can work because white's right silver is on 33. Please take a look at "Manabe Style" for comparison).

Instead, as soon as white starts attack, black counterattacks immediately.

Take a look at an example below:

Manabe Style is one of the formation against 44 silver formation Bear-in-the-Hole.

The style name is derived from Manabe Kazuo (9 dan), who was a professional shogi player using the style regularly (Unfortunately he died in 2007).

The keys of Manabe Style are as follows:

• Four Generals Mino, one of which silver is placed on 46. The mino castle is strong and extensive thanks to 4th file vanguard pawn.
  
• Parry static rook's 8th file attack easily, and then attack from 5th file

Manabe style make the opponent right silver move to 33 (which leads very storng Bear-in-the-Hole) on purpose.
Instead, Manabe style is more extensive and strong on 4th and 5th file.
In middle-game, basically Manabe Style attacks from 5th file using promoted pawns.

Take a look at an example below: