diff --git a/COPYING.md b/COPYING.md
index 6350853ebcff6..c769b07b19b2a 100644
--- a/COPYING.md
+++ b/COPYING.md
@@ -65,6 +65,7 @@ public/piece/dubrovny | sadsnake1 | [CC BY-NC-SA 4.0](https://creativecommons.or
 public/piece/libra | sadsnake1 | [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/)
 public/piece/anarcandy | [caderek](https://github.com/caderek) | [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/)
 public/piece/disguised | danegraphics | [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/)
+public/piece/kiwen-suwi | [neverRare](https://github.com/neverRare) | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)
 public/sounds/futuristic | [Enigmahack](https://github.com/Enigmahack) | AGPLv3+
 public/sounds/nes | [Enigmahack](https://github.com/Enigmahack) | AGPLv3+
 public/sounds/piano | [Enigmahack](https://github.com/Enigmahack) | AGPLv3+
diff --git a/bin/gen/piece-sprite b/bin/gen/piece-sprite
index 323f72e837f04..426e0c85ff8b8 100755
--- a/bin/gen/piece-sprite
+++ b/bin/gen/piece-sprite
@@ -39,7 +39,8 @@ themes = [
   ['horsey', 'svg'],
   ['anarcandy', 'svg'],
   ['disguised', 'svg'],
-  ['celtic', 'svg']
+  ['celtic', 'svg'],
+  ['kiwen-suwi', 'svg']
 ]
 types = {
   'svg' => 'svg+xml;base64,',
diff --git a/modules/pref/src/main/PieceSet.scala b/modules/pref/src/main/PieceSet.scala
index b0b9be370d3b4..45ab963e6fdf7 100644
--- a/modules/pref/src/main/PieceSet.scala
+++ b/modules/pref/src/main/PieceSet.scala
@@ -52,7 +52,8 @@ object PieceSet extends PieceSetObject:
     PieceSet("anarcandy"),
     PieceSet("shapes"),
     PieceSet("letter"),
-    PieceSet("disguised")
+    PieceSet("disguised"),
+    PieceSet("kiwen-suwi")
   )
 
 object PieceSet3d extends PieceSetObject:
diff --git a/public/piece-css/kiwen-suwi.css b/public/piece-css/kiwen-suwi.css
new file mode 100644
index 0000000000000..2bebd671a5b74
--- /dev/null
+++ b/public/piece-css/kiwen-suwi.css
@@ -0,0 +1,12 @@
+.is2d .pawn.white {background-image:url('data:image/svg+xml;base64,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')}
+.is2d .knight.white {background-image:url('data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9Im5vIj8+CjxzdmcKICAgd2lkdGg9IjI2MCIKICAgaGVpZ2h0PSIyNjAiCiAgIHhtbDpzcGFjZT0icHJlc2VydmUiCiAgIG92ZXJmbG93PSJoaWRkZW4iCiAgIHZlcnNpb249IjEuMSIKICAgaWQ9InN2Zzk1MSIKICAgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIgogICB4bWxuczpzdmc9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48ZGVmcwogICAgIGlkPSJkZWZzOTM5Ij48Y2xpcFBhdGgKICAgICAgIGlkPSJjbGlwMCI+PHJlY3QKICAgICAgICAgeD0iMTk0MCIKICAgICAgICAgeT0iMTc1NyIKICAgICAgICAgd2lkdGg9IjI2MCIKICAgICAgICAgaGVpZ2h0PSIyNjAiCiAgICAgICAgIGlkPSJyZWN0OTM2IiAvPjwvY2xpcFBhdGg+PC9kZWZzPjxnCiAgICAgY2xpcC1wYXRoPSJ1cmwoI2NsaXAwKSIKICAgICB0cmFuc2Zvcm09Im1hdHJpeCgwLjksMCwwLDAuOSwtMTczMi4zOTgxLC0xNTY4LjEzOTUpIgogICAgIGlkPSJnOTQ5Ij48cGF0aAogICAgICAgaWQ9InBhdGgxODIiCiAgICAgICBzdHlsZT0iY29sb3I6IzAwMDAwMDtmaWxsOiMyNjI2MjY7ZmlsbC1ydWxlOmV2ZW5vZGQ7c3Ryb2tlLW1pdGVybGltaXQ6ODstaW5rc2NhcGUtc3Ryb2tlOm5vbmUiCiAgICAgICBkPSJtIDE5OTMuNDk2NiwxNzcyLjM5NzcgYyAyLjQ0NTgsMTQuMzM1MSA0Ljg5MTcsMjcuMTU3NyA3LjMzNzUsNDEuNDkyOCAtMTIuNTUwNiwtMy4yMDgyIC0yNS43NzMzLC02LjkyMDUgLTM4LjMyMzksLTEwLjEyODcgNC44ODg0LDIwLjk3NjkgMTAuNDQ5MSw0My45NzAzIDE1LjMzNzUsNjQuOTQ3MiAtOS4zODE1LDE4Ljg2NTcgLTEyLjA2NjUsNDAuMTE2OCAtMTQuNDc4NCw2MC44MTE3IC0yLjU2NSwyNS4wMTI1IC0yLjMwNjQsNTAuMTkxNSAtMS42MTU0LDc1LjI5MTggaCAxNzkuMDc0MiBjIC03Ljg5NzgsLTMxLjU4NzkgLTE1Ljc5NTUsLTYzLjE3NTggLTIzLjY5MzMsLTk0Ljc2MzcgMjQuOTQ5NCwtNy45MTM3IDUyLjA1NTcsLTE4LjE5NDQgNjYuODU1MiwtNDEuMTQ3OSAxNC4yMTI3LC0yMy42MTkxIDQuNzI5NywtNTYuMzQ2MyAtMTYuMzc0MiwtNzIuNjg0NSAtMjMuODg4NiwtMTcuNjEyOSAtNTUuNTkzMywtMTguMjIzMiAtODMuOTI4MywtMTUuMDk0OSAtMTAuNzM5NywxLjA1MiAtMjAuOTczNyw0LjMzOSAtMzAuNjc2Miw4LjkyMTYgLTE5LjgzODIsLTUuODgxOCAtMzkuNjc2NSwtMTEuNzYzNiAtNTkuNTE0NywtMTcuNjQ1NCB6IiAvPjxwYXRoCiAgICAgICBpZD0icGF0aDk0MSIKICAgICAgIHN0eWxlPSJmaWxsOiNmZmZmZmY7ZmlsbC1vcGFjaXR5OjE7c3Ryb2tlOm5vbmUiCiAgICAgICBkPSJtIDIwMTQuMzM3OSwxNzk3LjkxMjEgYyAzLjU1NTMsMTMuNjcxOSA3LjExMDcsMjcuMzQzNyAxMC42NjYsNDEuMDE1NiAtMTMuMzQ2NCwtNC4xNDUyIC0yNi42OTI3LC04LjI5MDMgLTQwLjAzOTEsLTEyLjQzNTUgNSwxNC4zMzk4IDEwLDI4LjY3OTcgMTUsNDMuMDE5NSAtNC40MDg0LDEwLjQ5MDcgLTkuNzk4NSwyMC42Nzk5IC0xMS40NDE0LDMyLjA5MzggLTUuNjQzMSwyNy4xMTg4IC02LjcyMTEsNTQuOTUzMSAtNi40NzA3LDgyLjU3NjEgaCAxMzIuMzQ5NiBjIC01Ljc2MjQsLTIzLjA0NjIgLTExLjUyNDcsLTQ2LjA5MjQgLTE3LjI4NzEsLTY5LjEzODYgbCAtMjguODY0NSwzLjMyNDcgYyAtMC43NDY0LC02LjMwMTYgLTEuNDkyNywtMTIuNjAzMiAtMi4yMzksLTE4LjkwNDggMjguMTk5NCwtMy45OTQgNTYuOTU2LC0xMC4xNDMzIDgxLjc5MzYsLTI0LjY3ODcgMTEuMzQwMywtNi45MDQ0IDI0LjAwOCwtMTcuNjkyNSAyMi4yMzI0LC0zMi40NjI3IC0wLjI0MTgsLTEzLjcwMzEgLTcuNjU0NiwtMjcuMTc1NyAtMjAuMjMxMSwtMzMuMjA4MiAtMTkuNzM0MywtMTAuMDA0NiAtNDIuOTQzMywtOS45MTYxIC02NC40MjU0LC03LjM4NzIgLTExLjM3NTgsMC45MDggLTIxLjQ3NDksNi4yMjg1IC0zMS44NDA1LDEwLjQ2NzMgLTEzLjA2NzYsLTQuNzYwNCAtMjYuMTM1MiwtOS41MjA5IC0zOS4yMDI4LC0xNC4yODEzIHoiIC8+PHBhdGgKICAgICAgIGQ9Im0gMjA0MCwxODUzIGMgMCwtOS45NCA3Ljg0LC0xOCAxNy41LC0xOCA5LjY2LDAgMTcuNSw4LjA2IDE3LjUsMTggMCw5Ljk0IC03Ljg0LDE4IC0xNy41LDE4IC05LjY2LDAgLTE3LjUsLTguMDYgLTE3LjUsLTE4IHoiCiAgICAgICBmaWxsPSIjMjYyNjI2IgogICAgICAgZmlsbC1ydWxlPSJldmVub2RkIgogICAgICAgaWQ9InBhdGg5NDUiIC8+PHBhdGgKICAgICAgIGQ9Im0gMjA4MywxODMzLjUgYyAwLC05LjY2IDguMDYsLTE3LjUgMTgsLTE3LjUgOS45NCwwIDE4LDcuODQgMTgsMTcuNSAwLDkuNjcgLTguMDYsMTcuNSAtMTgsMTcuNSAtOS45NCwwIC0xOCwtNy44MyAtMTgsLTE3LjUgeiIKICAgICAgIGZpbGw9IiMyNjI2MjYiCiAgICAgICBmaWxsLXJ1bGU9ImV2ZW5vZGQiCiAgICAgICBpZD0icGF0aDk0NyIgLz48L2c+PC9zdmc+Cg==')}
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diff --git a/public/piece-css/kiwen-suwi.external.css b/public/piece-css/kiwen-suwi.external.css
new file mode 100644
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+       d="m 2040,1853 c 0,-9.94 7.84,-18 17.5,-18 9.66,0 17.5,8.06 17.5,18 0,9.94 -7.84,18 -17.5,18 -9.66,0 -17.5,-8.06 -17.5,-18 z"
+       fill="#262626"
+       fill-rule="evenodd"
+       id="path945" /><path
+       d="m 2083,1833.5 c 0,-9.66 8.06,-17.5 18,-17.5 9.94,0 18,7.84 18,17.5 0,9.67 -8.06,17.5 -18,17.5 -9.94,0 -18,-7.83 -18,-17.5 z"
+       fill="#262626"
+       fill-rule="evenodd"
+       id="path947" /></g></svg>
diff --git a/public/piece/kiwen-suwi/wP.svg b/public/piece/kiwen-suwi/wP.svg
new file mode 100644
index 0000000000000..ce21800730534
--- /dev/null
+++ b/public/piece/kiwen-suwi/wP.svg
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="260"
+   height="260"
+   xml:space="preserve"
+   overflow="hidden"
+   version="1.1"
+   id="svg13"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><defs
+     id="defs5"><clipPath
+       id="clip0"><rect
+         x="1161"
+         y="1757"
+         width="259"
+         height="260"
+         id="rect2" /></clipPath></defs><g
+     clip-path="url(#clip0)"
+     transform="matrix(0.9,0,0,0.9,-1031.9,-1567.7)"
+     id="g11"><path
+       style="color:#000000;fill:#262626;fill-rule:evenodd;stroke-miterlimit:8;-inkscape-stroke:none"
+       d="m 1244.293,1919.1875 -31.7364,83.625 h 14.9434 141.9434 l -31.7364,-83.625 z"
+       id="path9" /><path
+       id="path142"
+       style="fill:#ffffff;fill-opacity:1;stroke:none"
+       d="m 1258.5273,1939.8125 -16.0839,42.375 h 97.1132 l -16.0839,-42.375 z" /><path
+       style="color:#000000;fill:#262626;fill-rule:evenodd;stroke-miterlimit:8;-inkscape-stroke:none"
+       d="m 1289.5,1783.1875 c -31.0431,0 -56.3125,25.6202 -56.3125,56.8125 0,31.1923 25.2694,56.8125 56.3125,56.8125 31.0431,0 56.3125,-25.6202 56.3125,-56.8125 0,-31.1923 -25.2694,-56.8125 -56.3125,-56.8125 z"
+       id="path7" /><path
+       id="path140"
+       style="fill:#ffffff;fill-opacity:1;stroke:none"
+       d="m 1289.5,1803.8125 c -19.7769,0 -35.6875,16.0198 -35.6875,36.1875 0,20.1677 15.9106,36.1875 35.6875,36.1875 19.7769,0 35.6875,-16.0198 35.6875,-36.1875 0,-20.1677 -15.9106,-36.1875 -35.6875,-36.1875 z" /></g></svg>
diff --git a/public/piece/kiwen-suwi/wQ.svg b/public/piece/kiwen-suwi/wQ.svg
new file mode 100644
index 0000000000000..73a1144402da2
--- /dev/null
+++ b/public/piece/kiwen-suwi/wQ.svg
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="260"
+   height="260"
+   xml:space="preserve"
+   overflow="hidden"
+   version="1.1"
+   id="svg1466"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><defs
+     id="defs1460"><clipPath
+       id="clip0"><rect
+         x="2200"
+         y="1757"
+         width="260"
+         height="260"
+         id="rect1457" /></clipPath></defs><g
+     clip-path="url(#clip0)"
+     transform="matrix(0.9,0,0,0.9,-1966.95,-1568.208)"
+     id="g1464"><path
+       style="color:#000000;fill:#262626;fill-rule:evenodd;stroke-miterlimit:8;-inkscape-stroke:none"
+       d="M 105,-22.472656 58.775391,67.025391 -13.984375,-15.035156 12.066406,211.3125 H 197.93359 l 26.05078,-226.347656 -72.75976,82.060547 z"
+       id="path133"
+       transform="matrix(-1,0,0,1,2435.5,1793.5)" /><path
+       id="path1462"
+       style="fill:#ffffff;fill-opacity:1;stroke:none"
+       d="M 105,22.472656 146.70117,103.21289 196.01562,47.597656 179.54492,190.6875 H 30.455078 L 13.984375,47.597656 63.298828,103.21289 Z"
+       transform="matrix(-1,0,0,1,2435.5,1793.5)" /></g></svg>
diff --git a/public/piece/kiwen-suwi/wR.svg b/public/piece/kiwen-suwi/wR.svg
new file mode 100644
index 0000000000000..cd119baf9a253
--- /dev/null
+++ b/public/piece/kiwen-suwi/wR.svg
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="260"
+   height="260"
+   xml:space="preserve"
+   overflow="hidden"
+   version="1.1"
+   id="svg17"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><defs
+     id="defs5"><clipPath
+       id="clip0"><rect
+         x="1420"
+         y="1757"
+         width="260"
+         height="260"
+         id="rect2" /></clipPath></defs><g
+     clip-path="url(#clip0)"
+     transform="matrix(0.9,0,0,0.9,-1264.9,-1568.2)"
+     id="g15"><path
+       id="path1033"
+       style="color:#000000;fill:#262626;fill-rule:evenodd;stroke-miterlimit:8;-inkscape-stroke:none"
+       d="m 1455.1875,1773.1875 v 116.625 h 30.041 l -17.791,113 h 12.0625 155.0625 l -17.791,-113 h 30.041 v -116.625 z" /><path
+       style="fill:#ffffff;fill-opacity:1;stroke:none"
+       d="m 1506.1094,1889.8125 -14.5449,92.375 h 118.871 l -14.5449,-92.375 z"
+       id="path1038" /><path
+       style="fill:#ffffff;fill-opacity:1;stroke:none"
+       d="m 1475.8125,1793.8125 v 75.375 h 150.375 v -75.375 h -34.375 v 31.6582 h -20.625 v -31.6582 h -40.375 v 31.6582 h -20.625 v -31.6582 z"
+       id="path7" /></g></svg>
diff --git a/ui/dasher/src/piece.ts b/ui/dasher/src/piece.ts
index aa93adb730ae6..670459144c1d3 100644
--- a/ui/dasher/src/piece.ts
+++ b/ui/dasher/src/piece.ts
@@ -93,7 +93,7 @@ function applyPiece(t: Piece, list: Piece[], is3d: boolean) {
     $('body').removeClass(list.join(' ')).addClass(t);
   } else {
     const sprite = document.getElementById('piece-sprite') as HTMLLinkElement;
-    sprite.href = sprite.href.replace(/\w+(\.external|)\.css/, t + '$1.css');
+    sprite.href = sprite.href.replace(/[\w-]+(\.external|)\.css/, t + '$1.css');
     document.body.dataset.pieceSet = t;
   }
   lichess.pubsub.emit('theme.change');