Lines of single_doc/残局与实战.md from check-in 742531f152 that are changed by the sequence of edits moving toward check-in 76596bad24:

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                         2: <div class="title">残局与实战</div>
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                         4: <details>
                         5: <summary>
                         6: 前言
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                         8: 普通残局与实战不同。
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                        10: 练习残局，则残局方面的技术会提升；
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                        12: <b>练习实战</b>，则实战方面的技术会提升。
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                        14: </details>
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