Rooks and bishops need open lines.
That has been formulated more precise. Rooks and queens need open lines, queens and bishops need open diagonals. Rooks should be placed as far away as possible from other pieces, e.g. from the king in the endgame. Bishops and queens potentially too, however they control more squares in the center.
Chess has the concept of a bad bishop, which is a bishop which has not enough open diagonals, due to own pawns blocking them or opponents pieces/pawns controlling them.
One can generalize this to bad pieces. A knight in the corner, controlled by a bishop is a bad knight, a king cut off by a rook in the endgame is a bad king. There is also the saying "one bad piece worsens the whole position" and, positively formulated "talk with your pieces", speak, improve your worst piece.
Rowson has refined the concept of a bad bishop: "bad bishops protect good pawns", to denote cases where one side has a bad piece, but it is a good defender which holds together the position and gets compensated by other active pieces. As an example he gives the Najdorf bishop e7.
Begin tactical engagement with a pawn sacrifice.
That's not true. One may begin tactical engagement with any sacrifice or with none at all. Sacrifices are not required for tactical engagement. e.g. catching a queen can be called a tactical engagement. The queen does not have to take on b2 first.
think carefully about retreating moves.
That's half true. Always think carefully (but not necessarily long), also about attacking moves.
Retreating moves are a fundamental part of chess!
For example, to reorganize (consolidate) after a material win.
Or after provoking a weakness. E.g. a black bishop check on b4 and after the answer Bd2 the bishop retreats to e7. The Bd2 is then not well-placed. Or a bishop move to g5 in the King's Indian, and then the retreat to e3, in order to provoke h7-h6, which can, after h4-h5, even weaken e4!
Or to place a piece better, e.g. the f3 knight in King's Indian, which retreats to d2, in order to go to c4, or to e1 in order to go to d3. Or the d2 Knight in the Ruy Lopez, which retreats to f1 in order to go to g3 or e3. Or a d7 knight in a French structure, which retreats to b8 in order to go to c6, where it attacks d4. Or the slightly more mysterious retreat to b8 from c6 in the Ruy Lopez Breyer, in order to go to d7.
Retreating from a fork loses both tempo and material (literally "do not run from a fork").
That's a strange law ("do not run from a fork"). If the queen and rook are forked by a knight, the queen usually has to retreat. The meaning is, maybe, to search for tactical ways to escape from a fork?
Separate the king, rook, and bishop (or a fork will happen).
Is that so? Have you ever placed your pieces and thought, "Great, these will be well protected from future forks"? I do not think so. This is too blurry to consider it. And how would one do that? Is there a specific placement which is better than another?
A more useful rule is "check for forks", or more generally: "check for what the opponent can answer before you make the move". (trainers of children often call it "sit on your hands")
If the opponent's pieces are undefended, you won't be lost looking for an attacking move (forcing the opponent to retreat).
That has been formulated, e.g. "chess tactics from scratch" names hanging opponents pieces as an indicator to find tactics. Nunn has a chapter named "LPDO", "Loose pieces drop off" in one of his books, where he claims that most games are decided by such piece losses.
Therefore, shogi openings are both about activating your pieces (without hanging them) while securing your king in a castle (a shape where pieces and squares are defended).
It is called development in chess. Which is a special case of broader principles like "force accumulation", "force protection", "king safety", "restriction".
A threat is almost always stronger than its execution.
That's true. Has been said by Savielly Tartakower - https://de.wikipedia.org/wiki/Tartakowerismen (first quote). A concrete example are checks. Beginner like to give them, but a check is actually not relevant, relevant is if the king can escape. So it is better to first restrict the king and threaten the checkmate.
> Rooks and bishops need open lines.
That has been formulated more precise. Rooks and queens need open lines, queens and bishops need open diagonals. Rooks should be placed as far away as possible from other pieces, e.g. from the king in the endgame. Bishops and queens potentially too, however they control more squares in the center.
Chess has the concept of a bad bishop, which is a bishop which has not enough open diagonals, due to own pawns blocking them or opponents pieces/pawns controlling them.
One can generalize this to bad pieces. A knight in the corner, controlled by a bishop is a bad knight, a king cut off by a rook in the endgame is a bad king. There is also the saying "one bad piece worsens the whole position" and, positively formulated "talk with your pieces", speak, improve your worst piece.
Rowson has refined the concept of a bad bishop: "bad bishops protect good pawns", to denote cases where one side has a bad piece, but it is a good defender which holds together the position and gets compensated by other active pieces. As an example he gives the Najdorf bishop e7.
> Begin tactical engagement with a pawn sacrifice.
That's not true. One may begin tactical engagement with any sacrifice or with none at all. Sacrifices are not required for tactical engagement. e.g. catching a queen can be called a tactical engagement. The queen does not have to take on b2 first.
> think carefully about retreating moves.
That's half true. Always think carefully (but not necessarily long), also about attacking moves.
Retreating moves are a fundamental part of chess!
For example, to reorganize (consolidate) after a material win.
Or after provoking a weakness. E.g. a black bishop check on b4 and after the answer Bd2 the bishop retreats to e7. The Bd2 is then not well-placed. Or a bishop move to g5 in the King's Indian, and then the retreat to e3, in order to provoke h7-h6, which can, after h4-h5, even weaken e4!
Or to place a piece better, e.g. the f3 knight in King's Indian, which retreats to d2, in order to go to c4, or to e1 in order to go to d3. Or the d2 Knight in the Ruy Lopez, which retreats to f1 in order to go to g3 or e3. Or a d7 knight in a French structure, which retreats to b8 in order to go to c6, where it attacks d4. Or the slightly more mysterious retreat to b8 from c6 in the Ruy Lopez Breyer, in order to go to d7.
> Retreating from a fork loses both tempo and material (literally "do not run from a fork").
That's a strange law ("do not run from a fork"). If the queen and rook are forked by a knight, the queen usually has to retreat. The meaning is, maybe, to search for tactical ways to escape from a fork?
> Separate the king, rook, and bishop (or a fork will happen).
Is that so? Have you ever placed your pieces and thought, "Great, these will be well protected from future forks"? I do not think so. This is too blurry to consider it. And how would one do that? Is there a specific placement which is better than another?
A more useful rule is "check for forks", or more generally: "check for what the opponent can answer before you make the move". (trainers of children often call it "sit on your hands")
> If the opponent's pieces are undefended, you won't be lost looking for an attacking move (forcing the opponent to retreat).
That has been formulated, e.g. "chess tactics from scratch" names hanging opponents pieces as an indicator to find tactics. Nunn has a chapter named "LPDO", "Loose pieces drop off" in one of his books, where he claims that most games are decided by such piece losses.
> Therefore, shogi openings are both about activating your pieces (without hanging them) while securing your king in a castle (a shape where pieces and squares are defended).
It is called development in chess. Which is a special case of broader principles like "force accumulation", "force protection", "king safety", "restriction".
> A threat is almost always stronger than its execution.
That's true. Has been said by Savielly Tartakower - https://de.wikipedia.org/wiki/Tartakowerismen (first quote). A concrete example are checks. Beginner like to give them, but a check is actually not relevant, relevant is if the king can escape. So it is better to first restrict the king and threaten the checkmate.