[{"data":1,"prerenderedAt":176},["ShallowReactive",2],{"bot-ZKtsC":3},{"id":4,"aboutLong":5,"age":6,"botId":7,"country":8,"countryCode":9,"dataHash":10,"dateModified":11,"elo":12,"extension":13,"faq":14,"favoriteQuote":24,"gender":25,"hello":26,"introduction":27,"isTrophy":28,"liveDate":29,"luckyCharm":30,"meta":31,"name":32,"occupation":33,"openingAxes":34,"openingsAnalysis":37,"playstyle":129,"playstyleSummary":133,"ratingHistory":134,"shortName":141,"similar":142,"stem":172,"trophyQuirk":173,"trophyUnlock":173,"whoShouldPlay":174,"__hash__":175},"bots/bots/ZKtsC.json","Mark Kleen is a 26-year-old chess bot from the United States who works as a cleaner and treats every game like another surface to polish. Rated around 2181, Mark performs at a candidate master to expert level, with accurate calculation and enough opening preparation to punish typical club-player mistakes. As Black, he is loyal to the [Petrov Defense](/resources/openings/petrov-defense), aiming for symmetric, low-friction positions where small inaccuracies decide the outcome. As White, he sets up the [London System](/resources/openings/london-system), building a sturdy pawn chain before maneuvering toward e5. His favorite quote, \"Clean board, clear mind, victory shines,\" reflects the methodical approach he brings to the board. Opponents should expect quiet, technically demanding positions where Mark trades pieces early, simplifies the structure, and converts even modest edges into wins through patient endgame play.","26","ZKtsC","United States","us","bcf260bba4a3d4d5aa3e0fae728c72f9c6ee7641c997f191121b5731015fb640","2026-07-06",2181,"json",[15,18,21],{"question":16,"answer":17},"What rating is Mark?","Mark's estimated rating is 2181, placing him at the candidate master to expert level. At this strength he calculates accurately, knows his opening systems well, and reliably punishes tactical and positional mistakes from club-level opponents.",{"question":19,"answer":20},"What opening does Mark play?","With the white pieces Mark sets up the [London System](/resources/openings/london-system), a solid d4 structure aimed at a stable pawn chain and a knight outpost on e5. With Black against 1.e4 he plays the [Petrov Defense](/resources/openings/petrov-defense), and against 1.d4 he occasionally enters the [Nimzo-Indian](/resources/openings/nimzo-indian).",{"question":22,"answer":23},"How do strong club players prepare to face Mark?","Against a 2181-rated opponent, club players should study main lines of the Petrov and London deeply, since Mark follows theory and punishes shallow preparation. Avoid early simplifying trades that play into his style, and aim for unbalanced middlegames with imbalanced pawn structures where his tendency to liquidate becomes a weakness rather than a strength.","Clean board, clear mind, victory shines.","Male","Greetings brave challenger!! Mark **the Cleaner** stands ready!!! 🧼🛁💧 My board sparkles my mind shines and the **invisible invaders** of doubt tremble!! Shall we vanquish the grimeee of hesitation together?? Onward warrior onward!!","Prides himself on maintaining a pristine battlefield, your unseen guardian against germs in the chess game of office hygiene.",false,"2024-01-06T00:00:00.000Z","A Disinfectant Spray",{},"Mark Kleen","Cleaner",{"solid_sharp":35,"unprepared_theoretical":36},-1,0.655,{"stats":38,"whiteFingerprint":53,"blackFingerprint":86},{"total":39,"white":45,"black":49},{"games":40,"uniqueOpenings":41,"sharpness":42,"repertoireNarrowness":43,"theoryAdherence":44},1530,18,-1.1,0.87,0.44,{"games":46,"uniqueOpenings":41,"sharpness":47,"repertoireNarrowness":43,"theoryAdherence":48},539,-1.05,0.79,{"games":50,"uniqueOpenings":50,"sharpness":51,"repertoireNarrowness":50,"theoryAdherence":52},0,-1.16,0.09,{"firstMove":54},[55],{"name":56,"percent":57,"count":58,"lines":59,"responses":61},"d4",100,532,[60],[56],[62,75],{"name":63,"percent":64,"count":65,"lines":66,"variationBreakdown":68},"d5",81.5,212,[67],[56,63],[69],{"name":70,"percent":71,"count":65,"lines":72},"London System",80,[73],[56,63,74],"Bf4",{"name":76,"percent":77,"count":78,"lines":79,"variationBreakdown":81},"Nf6",18.5,48,[80],[56,76],[82],{"name":70,"percent":83,"count":78,"lines":84},92.3,[85],[56,76,74],{"vsFirstMove":87},[88,108],{"name":89,"lines":90,"responses":92},"e4",[91],[89],[93],{"name":94,"percent":95,"count":96,"lines":97,"variationBreakdown":100},"1...e5 (Open Games)",96,618,[98],[89,99],"e5",[101],{"name":102,"percent":103,"count":104,"lines":105},"Petrov Defense",70,256,[106],[89,99,107,76],"Nf3",{"name":56,"lines":109,"responses":111},[110],[56],[112],{"name":113,"percent":114,"count":115,"lines":116,"variationBreakdown":118},"Indian systems",59.9,124,[117],[56,76],[119],{"name":120,"percent":121,"count":122,"lines":123},"Nimzo-Indian",44.1,10,[124],[56,76,125,126,127,128],"c4","e6","Nc3","Bb4",{"defensive_aggressive":130,"simplifying_complicating":131,"category":132},-0.89,-0.85,1,"Mark plays an extremely defensive, solid style, almost always preferring quiet lines over sharp tactical melees. He simplifies positions readily, trading pieces to reduce complications, and leans on mainline theory rather than offbeat tries. With Black he steers into the drawish waters of the [Petrov Defense](/resources/openings/petrov-defense), while as White he sets up the [London System](/resources/openings/london-system) and grinds opponents in slow positional play.",[135,138],{"rating":136,"msSinceEpoch":137},2173,1779274374245,{"rating":139,"msSinceEpoch":140},2165,1779382287830,"Mark",{"sameStyle":143,"different":160},[144,149,155],{"botId":145,"name":146,"elo":12,"country":147,"countryCode":148,"category":132},"cIYar","Donna Vinchi","Spain","es",{"botId":150,"name":151,"elo":152,"country":153,"countryCode":154,"category":132},"EATCV","Carlos Bilda",2178,"Colombia","co",{"botId":156,"name":157,"elo":158,"country":159,"countryCode":9,"category":132},"KnhTl","Chloe Checklight",2184,"USA",[161,165],{"botId":162,"name":163,"elo":12,"country":8,"countryCode":9,"category":164},"nHNrh","Freddy Knightley",3,{"botId":166,"name":167,"elo":168,"country":169,"countryCode":170,"category":171},"JXrsk","Ivana Pawnski",2179,"Serbia","rs",4,"bots/ZKtsC",null,"Club players rated roughly 1700 to 2100 will get the most from a session with Mark. His expert-level accuracy exposes hopeful attacks and loose pawn structure, making him ideal for players who want to sharpen endgame technique and prophylactic thinking. Tactically minded attackers will find few open lines to exploit, so the matchup especially rewards those willing to outplay an opponent in long, quiet, maneuvering positions.","7CYBnwLK36KOEqHZGZ__Od-S7oGyLKbxGe0bavO9CuE",1784583532974]