HKB
a bad and dangerous position, you cannot obtain your Enemy's Leave to withdraw your Troops, and place them more securely, but you must abide all the consequences of your rashness.
And lastly, we learn by Chess the habit of not being discouraged by present appearances in the state of our affairs, the habit of hoping for a favourable Change, and that of persevering in the search of resources. The Game is so full of Events, there is such a variety of turns in it, the Fortune of it is so subject to sudden Vicissitudes, and one so frequently, after long contemplation, discovers the means of extricating one's self from a supposed insurmountable Difficulty, that one is encouraged to continue the Contest to the last, in hopes of Victory from our own skill, or at least [of getting a stale mate] from the Negligence of our Adversary. And whoever considers, what in Chess he often sees instances of, that [particular pieces of] success is [are] apt to produce Presumption, & its consequent Inattention, by which more is afterwards lost than was gain'd by the preceding Advantage, while misfortunes produce more care and attention, by which the loss may be recovered, will learn not to be too much discouraged by any present success of his Adversary, nor to despair of final good fortune upon every little Check he receives in the pursuit of it.
That we may therefore be induced more frequently to chuse this beneficial amusement, in preference to others which are not attended with the same advantages, every Circumstance that may increase the pleasure of it should be regarded; and every action or word that is unfair, disrespectful, or that in any way may give uneasiness, should be avoided, as contrary to the immediate intention of both the Players, which is to pass the Time agreably.
Therefore, first, if it is agreed to play according to the strict rules, then those rules are to be exactly observed by both parties, and should not be insisted on for one side, while deviated from by the other--for this is not equitable.
Secondly, if it is agreed not to observe the rules exactly, but one party demands indulgencies, he should then be as willing to allow them to the other.
Thirdly, no false move should ever be made to extricate yourself out of difficulty, or to gain an advantage. There can be no pleasure in playing with a person once detected in such unfair practice.
Fourthly, if your adversary is long in playing, you ought not to hurry him, or express any uneasiness at his delay. You should not sing, nor whistle, nor look at your watch, nor take up a book to read, nor make a tapping with your feet on the floor, or with your fingers on the table, nor do any thing that may disturb his attention. For all these things displease; and they do not show your skill in playing, but your craftiness or your rudeness.
Fifthly, you ought not to endeavour to amuse and deceive your adversary, by pretending to have made bad moves, and saying that you have now lost the game, in order to make him secure and careless, and inattentive to your schemes: for this is fraud and deceit, not skill in the game.
Sixthly, you must not, when you have gained a victory, use any triumphing or insulting expression, nor show too much pleasure; but endeavour to console your adversary, and make him less dissatisfied with himself, by every kind of civil expression that may be used with truth, such as, "you understand the game better than I, but you are a little inattentive;" or, "you play too fast;" or, "you had the best of the game, but something happened to divert your thoughts, and that turned it in my favour."