Command at Sea-jumpstart 中译

白幢天子

Adiralty Trilogy海军上将三部曲中的一部，用来推演二战时期的海战（本人最喜欢二战太平洋战场）。AT一直致力于将三个游戏的系统统一，所以三个游戏在主要规则和图表上是完全一样的。

要更深入地了解这个系统并进行推演，还是需要购买完整版规则，游戏手册和船表。

翻译的过程中我也看了Fear God & Dread Nought-Jumpstart，发现系统共用的图表FG&DN的jumpstart上有，而CaS上却没有，奇怪。

海军上将三部曲系列目前包括4 部战术海战兵棋

Dawn of the Battleship (1894-1905)；

Fear God & Dread Nought 2nd edition (1906-1925)；

Command at Sea (1926 - 1955)；

Harpoon5 (1956-2020）.  

在翻译的过程中遇到几个值得一提的问题。

1.AOB（Angle of Bow）

TDC是torpedo data computer (鱼雷数据计算机)的缩写，是一种机械计算机，二战中潜艇部队均用类似装备进行鱼雷的准确攻击，TDC的根本功能即为：设定鱼雷偏转角，所以偏转角度数是TDC中的核心数据。该种计算机有一个重要的特点就是：偏转角的大小和鱼雷航线误差成正比。

2. chase salvoes（又做chase salvos)

简单地说就是以机动规避来自敌人的攻击的同时攻击对方，追逐射击

下图是罗德尼号和俾斯麦号战列舰间的“chase salvos”

3.The Flaming Datum problem

顾名思义，Flaming Datu problem,火焰基准点问题，即通过攻击可能位置的敌方舰艇进行侦测的方式，这是一个关于隐藏自己发现敌人的零和博弈问题。这个问题对潜艇攻击至关重要。

在Two-Person Zero-Sum Games中一节Moving Search in Two Dimensions, P&M讲到The Flaming Datum problem——

In the Princess and Monster (P&M) game, Princess is trapped within the unit circle, pursued by a blind Monster who will catch her if the distance between themever gets as small as d, a given small but positive capture distance. The P&M game was introduced by Isaacs (1965) as a prototype where both parties are capable of motion.The Flaming Datum problem is related in an odd way to the P&M game. The name comes from a situation where a submarine has just torpedoed a merchant ship, and retaliatory forces arrive after a time delay. The torpedoed ship marks the place where the submarine once was, and thus acts as a “flaming datum” for the subsequent search for the submerged Evader. Evader might also be a burglar who has triggered an alarm and expects pursuit by police. In general, Evader commits an act that marks his position at time 0. After a time delay τ, Searcher arrives and begins searching while Evader tries to leave the area at a speed that cannot exceed U.

At time t, Evader must be somewhere within a farthest-on-circle (FOC) with radius Ut. This expanding circle takes the place of the unit disk that confines Princess in the P&M game.”

在The Diesel Submarine Flaming Datum Problem有

“The Flaming Datum problem is one of relocating an enemy target that is fleeing after momentarily revealing its position. A diesel submarine faces this problem after attacking a ship, since the ship creates a visible marker of where the submarine must once have been. The tactical problem has been studied before underthe assumption that the submarine’s motion is constrained only by a top speed.

Here we add the constraint that the battery’s capacity is also finite. The problem is bounded rather than solved. Techniques used include two-person zero-sum game theory and optimal control theory.”

2020.3.10
  版本更新

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