[{"data":1,"prerenderedAt":344},["ShallowReactive",2],{"bot-sFaCT":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":215,"playstyleSummary":218,"ratingHistory":219,"shortName":308,"similar":309,"stem":340,"trophyQuirk":341,"trophyUnlock":341,"whoShouldPlay":342,"__hash__":343},"bots/bots/sFaCT.json","Yumi Kastling is a 79-year-old mystery shopper from Japan, evaluating customer service across Tokyo's retail stores when she is not seated at the chessboard. Her keen eye for small details translates into a careful, observational style of play, though her 1522 rating places her firmly in the intermediate club bracket rather than among trained masters. Yumi has spent decades around the game without ever drilling deep theory, preferring quiet evenings with a teacup and a board to formal study. With the white pieces she gravitates toward classical setups, most often steering games into the [Queen's Gambit](/resources/openings/queens-gambit), where her instinct for central control rewards patience. Visitors can expect a thoughtful opponent who calculates two or three moves ahead, trades pieces willingly to simplify the position, and punishes careless development without ever forcing wild complications.","79","sFaCT","Japan","jp","831a15a189b0343c2d938a0506f68af9103ed19af4d660eb44505b1fddaabc21","2026-07-06",1522,"json",[15,18,21],{"question":16,"answer":17},"What rating is Yumi?","Yumi plays at an estimated 1522 Elo, which places her in the intermediate club-player range. She has a solid opening repertoire, calculates two to three moves deep, and handles standard endgames with reasonable technique.",{"question":19,"answer":20},"What opening does Yumi play?","With the white pieces Yumi most often opens with the [Queen's Gambit](/resources/openings/queens-gambit), her most-played system across 135 games on record. She also frequently steers into the [London System](/resources/openings/london-system), and occasionally tries the Ponziani or Scotch Game when she wants a more open center.",{"question":22,"answer":23},"How can intermediate players use Yumi to improve?","Players in the 1300 to 1700 range can use Yumi to practice handling early piece trades, since she simplifies aggressively rather than keeping tension on the board. Studying her Queen's Gambit and London System lines is good preparation for facing classical 1.d4 setups, and her willingness to enter endgames gives intermediates regular practice converting small structural advantages.","Behind the smile lies a mind that anticipates every move, both in life and chess.","Female","Ah! Honored guest arrives? *Welcome* to my humble board? Like cherry blossoms greeting spring? Shall we wake the honorable warriors? Oh! Perhaps today we capture the moon together? 🌸","Evaluates customer service in retail stores across Tokyo. Her keen observational skills make her a formidable chess opponent, always ready to analyze her adversary's next move.",false,"2023-12-08T00:00:00.000Z","A Lucky Teacup",{},"Yumi Kastling","Mystery Shopper",{"solid_sharp":35,"unprepared_theoretical":36},-0.38,-0.13,{"stats":38,"whiteFingerprint":52,"blackFingerprint":159},{"total":39,"white":44,"black":48},{"games":40,"uniqueOpenings":41,"sharpness":35,"repertoireNarrowness":42,"theoryAdherence":43},1538,99,-0.9,0.64,{"games":45,"uniqueOpenings":41,"sharpness":46,"repertoireNarrowness":42,"theoryAdherence":47},943,-0.09,0.93,{"games":49,"uniqueOpenings":49,"sharpness":50,"repertoireNarrowness":49,"theoryAdherence":51},0,-0.67,0.34,{"firstMove":53},[54,116],{"name":55,"percent":56,"count":57,"lines":58,"responses":60},"e4",59.2,580,[59],[55],[61,84,102],{"name":62,"percent":63,"count":64,"lines":65,"variationBreakdown":67},"e5",90.5,152,[66],[55,62],[68,77],{"name":69,"percent":70,"count":71,"lines":72},"Ponziani",45.3,92,[73],[55,62,74,75,76],"Nf3","Nc6","c3",{"name":78,"percent":79,"count":80,"lines":81},"Scotch Game",29.6,60,[82],[55,62,74,75,83],"d4",{"name":85,"percent":86,"count":87,"lines":88,"variationBreakdown":91},"Sicilian",8.3,14,[89],[55,90],"c5",[92],{"name":93,"percent":94,"count":87,"lines":95,"mainlines":98},"Other Anti-Sicilians",77.8,[96],[55,90,97],"...",[83,76,99,100,101,74],"Nc3","Bc4","b4",{"name":103,"percent":104,"count":105,"lines":106,"variationBreakdown":109},"Caro-Kann",1.2,2,[107],[55,108],"c6",[110],{"name":111,"percent":112,"count":105,"lines":113},"Advance Caro-Kann",100,[114],[55,108,83,115,62],"d5",{"name":83,"percent":117,"count":118,"lines":119,"responses":121},40.3,395,[120],[83],[122,141],{"name":115,"percent":123,"count":124,"lines":125,"variationBreakdown":127},88.3,218,[126],[83,115],[128,134],{"name":129,"percent":56,"count":130,"lines":131},"Queen's Gambit",135,[132],[83,115,133],"c4",{"name":135,"percent":136,"count":137,"lines":138},"London System",36.4,83,[139],[83,115,140],"Bf4",{"name":142,"percent":143,"count":144,"lines":145,"variationBreakdown":147},"Nf6",11.7,29,[146],[83,142],[148,154],{"name":149,"percent":150,"count":151,"lines":152},"Indian Game mainlines",48.6,18,[153],[83,142,133],{"name":135,"percent":155,"count":156,"lines":157},29.7,11,[158],[83,142,140],{"vsFirstMove":160},[161,178],{"name":55,"lines":162,"responses":164},[163],[55],[165],{"name":103,"percent":166,"count":167,"lines":168,"variationBreakdown":170},89.4,339,[169],[55,108],[171],{"name":172,"percent":166,"count":173,"lines":174},"Tartakower Caro-Kann",16,[175],[55,108,83,115,99,176,177,142],"dxe4","Nxe4",{"name":83,"lines":179,"responses":181},[180],[83],[182,202],{"name":183,"percent":184,"count":185,"lines":186,"variationBreakdown":188},"1...d5 systems",43.7,59,[187],[83,115],[189,196],{"name":190,"percent":191,"count":192,"lines":193},"QGD",23.5,7,[194],[83,115,133,195],"e6",{"name":197,"percent":198,"count":199,"lines":200},"Slav",13.4,4,[201],[83,115,133,108],{"name":203,"percent":204,"count":205,"lines":206,"variationBreakdown":208},"Indian systems",37,50,[207],[83,142],[209],{"name":210,"percent":204,"count":211,"lines":212},"Grünfeld",12,[213],[83,142,133,214,99,115],"g6",{"defensive_aggressive":216,"simplifying_complicating":217,"category":199},0.72,-0.96,"Yumi plays aggressively for an intermediate, pressing forward with the initiative, yet she almost always reduces tension by trading pieces and steering toward clearer positions. Her opening choices lean slightly offbeat and solid rather than razor-sharp theory. With white she favors the [Queen's Gambit](/resources/openings/queens-gambit) and the quieter [London System](/resources/openings/london-system), pushing the agenda early then simplifying once a small advantage appears.",[220,223,226,229,231,234,237,240,243,246,249,252,255,258,261,263,266,269,272,275,278,281,284,287,289,292,295,298,300,303,305],{"rating":221,"msSinceEpoch":222},1524,1777662407232,{"rating":224,"msSinceEpoch":225},1531,1777663886571,{"rating":227,"msSinceEpoch":228},1530,1777664911975,{"rating":12,"msSinceEpoch":230},1777666354504,{"rating":232,"msSinceEpoch":233},1511,1777759080473,{"rating":235,"msSinceEpoch":236},1500,1777759299383,{"rating":238,"msSinceEpoch":239},1489,1777759402448,{"rating":241,"msSinceEpoch":242},1496,1777759566093,{"rating":244,"msSinceEpoch":245},1502,1777759798133,{"rating":247,"msSinceEpoch":248},1508,1777759878754,{"rating":250,"msSinceEpoch":251},1514,1777759979037,{"rating":253,"msSinceEpoch":254},1519,1777760043833,{"rating":256,"msSinceEpoch":257},1507,1777760286727,{"rating":259,"msSinceEpoch":260},1513,1777760497620,{"rating":235,"msSinceEpoch":262},1777760527267,{"rating":264,"msSinceEpoch":265},1488,1777760791653,{"rating":267,"msSinceEpoch":268},1484,1777907378434,{"rating":270,"msSinceEpoch":271},1468,1777951281333,{"rating":273,"msSinceEpoch":274},1466,1777985760634,{"rating":276,"msSinceEpoch":277},1463,1778020698923,{"rating":279,"msSinceEpoch":280},1473,1778055789749,{"rating":282,"msSinceEpoch":283},1483,1778055812538,{"rating":285,"msSinceEpoch":286},1493,1778056209507,{"rating":244,"msSinceEpoch":288},1778056413772,{"rating":290,"msSinceEpoch":291},1491,1778056740513,{"rating":293,"msSinceEpoch":294},1487,1778099625218,{"rating":296,"msSinceEpoch":297},1486,1778112803784,{"rating":282,"msSinceEpoch":299},1778242571294,{"rating":301,"msSinceEpoch":302},1475,1778939507195,{"rating":273,"msSinceEpoch":304},1779248190005,{"rating":306,"msSinceEpoch":307},1457,1779309057975,"Yumi",{"sameStyle":310,"different":326},[311,316,321],{"botId":312,"name":313,"elo":253,"country":314,"countryCode":315,"category":199},"nguye","Mai Nguyen","USA","us",{"botId":317,"name":318,"elo":224,"country":319,"countryCode":320,"category":199},"llewe","Gwyneth Llewellyn","UK","gb",{"botId":322,"name":323,"elo":324,"country":325,"countryCode":315,"category":199},"RYzpL","Candy Apple",1534,"United States",[327,333],{"botId":328,"name":329,"elo":12,"country":330,"countryCode":331,"category":332},"m_6_b","Inaru Mariwa","Guyana","gy",3,{"botId":334,"name":335,"elo":336,"country":337,"countryCode":338,"category":339},"mpPHd","Conrad Puzzle",1523,"Germany","de",1,"bots/sFaCT",null,"Club players rated roughly 1300 to 1700 will find Yumi a useful sparring partner. Her preference for trading pieces and simplifying punishes opponents who rely on tactical chaos and rewards those who study endgames and positional pressure. Beginners working on opening principles will see a clean classical structure across the board, while stronger intermediates can practice converting small structural edges against an opponent who refuses to let positions stay messy.","aRheLLl8LDaPZ0iampFuxeEHutY0YuhtMXBOzcSeYVs",1784583547204]