cannon (2. C5+4 or 2. Cxe7+) is a beginner's trap that impedes development and coordination of Red's pieces if Black plays correctly (for example, 1. Che3 Che8 2. Cxe7+?? Ade9 3. Hg3 Hg8 4. Ce5 Rh10 when Black develops the rook first, and the loss of Black's middle pawn actually enabled Black's horses to occupy the centre on the next moves). Other common first moves by Red include moving an elephant to the central column (1. Ege3), advancing the soldier on the third or seventh file (1. c5), moving a horse forward (1. Hg3), and moving either cannon to the 4th or 6th (d- or f-) file (1. Chd3 or 1. Chf3). Compared to the Central Cannon openings, these openings are generally less restricted by theory. General advice for the opening includes rapid development of at least one chariot and putting it on open files and ranks, as it is the most powerful piece with a long attack range. There is a saying that only a poor player does not move a chariot in the first three moves (Chinese: 三步不出車，必定要輸棋); however this is not to be taken literally, and is in fact often violated in modern Xiangqi games. Attacking and defending the centre, especially the central soldiers / central pawns, are common themes in the opening, hence the Central Cannon openings. Usually, at least one horse should be moved to the middle in order to defend the central soldier; however undefended central soldiers can also become "poisoned pawns" in the early moves, especially if the attacking side does not have an immediate follow-up to retain the pressure on the central file. Middlegame strategy Xiangqi strategy shares common themes with chess, but have some differences: Occupying the centre is relatively less important in xiangqi, but controlling and attacking the middle file is still one of the vital themes. Since the middle file is often well defended, players would then seek to mount an offence on either of the flanks on the enemy side, especially when the defence of one flank is neglected. The significance of pawn formation in xiangqi and chess are different. In xiangqi, soldiers (pawns) are often pushed to avoid blocking their own horses, and it is uncommon for them to defend each other (in contrast with a Western chess pawn chain). Successfully getting a soldier to cross a river as an attacking force can often tilt the scales