First winter ascent of <a href="https://en.wikipedia.org/wiki/Mount_Everest" id="mwASA" rel="mw:WikiLink" title="Mount Everest">Mount Everest</a> by <a href="https://en.wikipedia.org/wiki/Krzysztof_Wielicki" id="mwASE" rel="mw:WikiLink" title="Krzysztof Wielicki">Krzysztof Wielicki</a> and <a href="https://en.wikipedia.org/wiki/Leszek_Cichy" id="mwASI" rel="mw:WikiLink" title="Leszek Cichy">Leszek Cichy</a>.