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chore(middlewareNode): remove dead lesson FEN data from lessons.js (Issue 11) #261

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chore(middlewareNode): remove dead lesson FEN data from lessons.js (Issue 11) #261

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chore(middlewareNode): remove dead lesson FEN data from lessons.js (I…
Deepesh-Katudia Oct 1, 2026
5e2648d
Merge branch 'main' into chore/issue-11-lessons-dead-data
ToldYO Oct 7, 2026
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253 changes: 0 additions & 253 deletions middlewareNode/src/routes/lessons.js
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Original file line number Diff line number Diff line change
Expand Up @@ -607,256 +607,3 @@ function getClientIp(req) {
}

module.exports = router;

/**
* Legacy data structure containing end FEN positions for lessons
* Used for data migration and testing purposes
* Contains lesson completion states for various chess tactics and pieces
*/
list = [
{
name: "Piece Checkmate 1 Basic checkmates",
list: ["8/8/7R/3k4/3Q4/4K3/8/8 b - - 5 3",
"8/8/R7/1R6/8/1k1K4/8/8 b - - 7 4",
"8/5Q2/5k2/8/2B2K2/8/8/8 b - - 9 5",
"8/kQ6/8/2N5/8/3K4/8/8 b - - 9 5",
"8/8/8/8/2K5/kQ6/8/8 b - - 11 6",
"R7/8/k1K5/8/8/8/8/8 b - - 21 11"
]
},
{
name: "The Pin Pin it to win it",
list: ["8/6k1/8/4B3/4P3/8/8/7K b - - 0 2",
"4k3/p1p2pp1/7p/2B5/8/1P3P2/P1P3PP/1K6 b - - 0 2",
"1k6/ppp3q1/8/4r3/8/2B5/5PPP/R4QK1 b - - 1 1",
"8/4k1p1/5p1p/4P3/8/7P/6P1/4R1K1 b - - 0 2",
"r4rk1/pp1p1ppp/1qp2B2/8/4P3/1P1P2Q1/P1P2PPP/R4RK1 b - - 0 1",
"4r1r1/2p5/1p1kn3/p1p1R1N1/P6p/7P/1PP1R1PK/8 b - - 0 1",
"1r1n1rk1/ppq2pQ1/2b5/2pB3p/2P4P/4P3/PB3PP1/1R3RK1 b - - 0 2",
"q5k1/5pp1/8/1pb1P3/2p5/2P3p1/1P3P2/1N3RK1 w - - 0 4"
]
},
{
name: "The Skewer Yum - Skewers!",
list: ["8/1Bq2k2/4ppp1/8/5P2/4P3/4QK2/5R2 b - - 0 2",
"r2r2k1/2p2ppp/5n2/4p3/p3P3/P6P/3B1PP1/2RQ2K1 b - - 0 2",
"5r1k/ppq3p1/3b4/2p2n2/2Pp1P1P/PP1Q2P1/3BN3/R3K2b w Q - 0 25",
"8/3qk3/8/8/5B2/4Kb2/8/8 w - - 0 3",
"8/1p4Q1/p2k4/6p1/P3b3/7P/5PP1/6K1 b - - 0 53",
"3k4/5R2/3b1P2/3p4/3P1p2/2p4P/2P3P1/7K b - - 0 3",
"8/pp1b4/5pp1/3k4/2p5/Q1P2P2/5KP1/8 b - - 0 42",
"B7/6p1/7p/2k5/p7/8/2P3P1/2K5 b - - 0 3"
]
},
{
name: "The Fork Use the fork, Luke",
list: ["2N5/5k2/8/8/6P1/7K/8/8 b - - 0 2",
"7k/5N1p/p7/nppP2q1/2P5/1P2N3/P6P/7K b - - 0 2",
"7k/5n2/8/4P3/8/8/6PP/5R1K b - - 0 2",
"r1bqkb1r/ppp2ppp/2n5/4p3/4p3/3B1N2/PPPP1PPP/R1BQK2R w KQkq - 0 4",
"8/8/R7/5k2/8/8/1K6/8 b - - 0 2",
"8/5k2/8/8/8/B6P/8/6K1 b - - 0 2",
"7Q/2nk1p1p/6p1/3n4/8/8/5PPP/6K1 b - - 0 2",
"N7/3k3p/6p1/5p2/r7/3P4/PPP2PPP/R5K1 b - - 0 3",
"3r1k2/pp1n2pb/2p2p1N/2P2r2/2QPp2p/P1P1B2P/6P1/1R1R2K1 b - - 0 2",
"8/5pk1/8/4p3/pp2P3/5P2/PP3K2/2n5 w - - 0 4",
"R7/5bN1/4k3/p3P3/8/5K2/8/8 b - - 0 4",
"r5k1/ppp2p1p/6pB/8/3bP2q/2NB2RP/PPP2nP1/R2Q3K w - - 1 5",
"6k1/1q6/p3p3/2P5/P3P2P/2P5/4Q1PK/8 b - - 0 3",
"5Bk1/1q1r2p1/5p1p/8/2P5/6PP/P4P2/4R1K1 w - - 0 34",
"r1bq1rk1/4p1bp/p2p1p2/1PpPn1B1/4PQ2/2N5/PP1N2PP/R3KB1R w KQ - 1 4",
"4b2r/5kP1/4p2n/pp1p3P/2pP1R2/P1P2B1N/2PK1P2/8 b - - 0 3"
]
},
{
name: "Discovered Attacks Including discovered checks",
list: [
"4kR2/6pp/8/4N3/8/8/6PP/6K1 b - - 0 2",
"8/3Nk1pp/8/8/8/8/6PP/5RK1 b - - 0 2",
"B4k2/3r1pp1/3P3p/8/8/5N2/6PP/5RK1 b - - 0 2",
"r2q1bnN/pp3kpp/3p1p2/1Bp3B1/8/2Pp4/PP3PPP/RN1bR1K1 b - - 0 13",
"r1b2rk1/pp1n1p1p/6p1/3p4/3bP3/1PqB3P/P2N2PN/R2Q1R1K w - - 2 17",
"2k5/8/p2P4/2p1b3/8/2P4r/P4R2/1K2R3 b - - 0 43",
"8/2N5/4np2/4pk1p/R6P/P3KP2/1P6/8 b - - 0 2",
"r1bq2rk/1p1p1N2/p1n1pP1p/3n4/8/1N1Bb3/PPP3PP/R4R1K b - - 3 3",
"8/5ppk/p3p2p/1p1b4/3Pp3/1P2b1P1/P6P/2R2K2 w - - 0 4",
"4r3/1R2qk1p/1Q4p1/1Pp5/2P5/6P1/6KP/8 b - - 0 53"
]
},
{
name: "Double Check A very powerfull tactic",
list: [
"",
"r3k3/ppp2pp1/2np4/2B1p3/2B1P1N1/3P2n1/PPP2PP1/RN1Q1RKr w q - 3 14",
"",
"",
"3r2k1/pp6/6p1/2P1q2p/4p3/4BK2/PP2P2r/R1Q1R2B w - - 0 30",
"B6r/2qk1P1p/p5p1/1p2p3/8/2P1B3/P1PR2PP/5RK1 b - - 0 25"
]
},
{
name: "Overloaded Pieces They have too much work",
list: [
"6k1/5pp1/4R1n1/8/8/3B4/5PPP/6K1 b - - 0 1",
"2r1rbk1/3P1pp1/5n2/8/8/3Q3P/2B2PPK/8 b - - 0 1",
"6b1/4k2p/7P/1p1pKBP1/1P1P4/8/5P2/8 b - - 2 4",
"3q3k/pp2R1pp/8/2P5/1P3BQ1/2P5/P4rPp/7K b - - 0 29",
"8/6Q1/p3p1k1/3nB1r1/8/3q3P/PP6/K1R5 b - - 0 36",
"4R3/pb1R1p1k/1pn2qpp/8/4B3/P4NP1/1P3PP1/6K1 b - - 0 26",
"5R2/1p5k/p2pp3/8/7p/8/PP4P1/6K1 b - - 0 4",
"1r3k1r/p4p2/7p/3pP3/8/4BPN1/6P1/2R3K1 b - - 0 3",
"5k2/1pp4p/p1n3p1/8/1P2q3/P3P1Pb/3N3P/6K1 w - - 0 4",
"rk2Q3/5p1p/p1n2p2/P1b5/2p5/2P3P1/5P1P/6K1 b - - 0 32"
]
},
{
name: "Zwischenzug In-between moves",
list: [
"1rbqk2r/pp3ppp/8/3n4/1bpP4/8/PP2BKPP/RN1Q2NR w k - 0 11",
"5rk1/pp1b1ppp/4p3/3pP3/1q3Pn1/3B1N2/P2K2PP/RN3Q2 w - - 0 19",
"B3k3/3b1q2/p2bp3/6Q1/8/4B1P1/PPP4P/6K1 b - - 0 31",
"2r3k1/B5pp/4p3/1Q1p1p2/1p3P2/1P2P3/P1r3PP/6K1 b - - 0 29",
"2B2r1k/1pN1Qpbp/p4pp1/q7/8/8/PP3PPP/3R2K1 b - - 0 25"
]
},
{
name: "Interference Interpose a piece to great effect",
list: [
"4r1k1/p1p1qppp/3b1n2/1r1p4/P2P4/2P5/1P2BPPP/R1B1KN1R w KQ - 0 16",
"1k6/1pp2pp1/p1p5/8/8/2Pp1Pp1/PP2q1P1/R1BK1N2 w - - 4 27",
"1R4k1/p3bppp/4p3/8/3r4/6P1/P3PP1P/5RK1 b - - 0 19",
"3r2k1/pp3p1p/6p1/8/4P3/5P2/PP2nKPP/2B5 w - - 0 26",
"3B2k1/6p1/3b4/1p1p3q/3P4/2P1pNPb/1P3P1P/R5K1 w - - 0 32",
"2r4k/5pR1/7p/5q2/4p2P/1Qn1P3/5P1K/8 w - - 0 38",
"5q2/1b4pk/1p2p1n1/1P1pPp2/P2P1P1p/1N3R1P/1Q4PK/8 b - - 0 47"
]
},
{
name: "Greek Gift Study the greek gift scrifice",
list: [
"rnb2rk1/pppn1pp1/4p3/3pP1B1/1b1P4/2NQ4/PPP2PPP/R3K2R b KQ - 0 4",
"rnb2rk1/pp3p1Q/4p3/3pn1N1/3p4/2NB4/PPP2PP1/R3K2R b KQ - 5 16",
"r3r2k/1b3Qp1/p7/1p1P1R2/1P6/P3q3/6PP/3R3K b - - 4 26",
"r3rbk1/6p1/pn4p1/np2p1B1/3p4/5Q2/PP3PP1/2R1R1K1 b - - 1 25",
"3r1B1Q/bpq2k2/p1b1pp2/2P5/1P6/P7/5PPP/2R2RK1 b - - 0 22",
"r1b2rk1/ppq2pp1/4pn2/2p3NQ/1p1P4/8/PP1N1PPP/R4RK1 w - - 0 16"
]
},
{
name: "Deflection Distracting a defender",
list: [
"5R2/5ppk/4b3/8/8/7P/5PP1/6K1 b - - 0 2",
"8/8/8/1k4Q1/8/8/5K2/8 b - - 0 3",
"4r1k1/1p1Q1p1p/p2p1Pp1/1n1P4/1P6/6P1/P4PKP/4R3 b - - 0 4",
"rnbQ1b1r/pp2pkpp/5n2/8/4P3/2N5/PPP2PPP/R1B1K2R b - - 0 2",
"2b2qk1/7Q/3r2p1/8/8/3r3R/6PP/6K1 b - - 0 2",
"6k1/5p2/3q2pp/8/6P1/5QNP/5P2/4r1K1 w - - 0 3",
"r3r1k1/p4pp1/1p1Q3p/8/P7/7P/1P3PP1/R5K1 b - - 0 2",
"r5rk/6qQ/p1p2B1p/PpP5/1P6/2PB2P1/5PKP/8 b - - 1 3",
"r1bk3r/pppp2p1/1n3p1p/7n/2N4Q/5P2/PPP3PP/R3R1K1 b - - 0 2",
"6k1/2r2pp1/5q1p/Np6/8/1P5Q/3pbPPR/1R4K1 w - - 0 6"
]
},
{
name: "Attraction Lure a piece to bad square",
list: [
"3R1k2/5p1p/8/5N2/8/5p1q/8/6K1 b - - 0 3",
"rnbB1b1r/ppk2ppp/2p5/4q3/4n3/8/PPP2PPP/2KR1BNR b - - 3 11",
"r2B3r/3n2pp/p2bR3/1b1k1P2/1qpPB3/4P1PP/5P1K/8 b - - 1 2",
"",
"",
"8/5pk1/4p3/1p6/6P1/4P3/PR2KP2/7q w - - 0 4",
"",
"6k1/pp4bp/2n2np1/5p2/2P2q2/4KBN1/PP5P/RQ6 w - - 0 24",
"",
"7r/6kp/5Rp1/8/8/8/6PP/2B3K1 b - - 0 1"
]
},
{
name: "Underpromotion Promote - but not to a queen!",
list: [
"5N1n/r6k/5b2/5N1p/8/1q6/PP6/K5R1 b - - 0 1",
"5R2/7k/8/7K/8/8/8/8 b - - 0 1",
"1R1B4/8/k7/8/8/5K2/8/8 b - - 0 1",
"5R2/7k/5K2/8/8/8/8/8 b - - 0 1",
"8/7p/7B/5k1p/7P/5K2/8/8 b - - 0 2",
"8/8/8/8/8/k7/1b1n4/KB6 w - - 4 4",
"B3Q3/1q4pk/5p1p/5P1K/6PP/8/8/8 b - - 0 1",
"5N2/3q3k/8/8/6p1/6Pp/7P/7K b - - 0 3",
"6K1/8/5k2/8/8/8/8/8 b - - 0 2",
"3N4/k7/P7/1K6/8/8/8/8 b - - 0 1"
]
},
{
name: "Desperado A piece is lost, but it can still help",
list: [
"r3kb1r/pp3ppp/2N1pn2/8/3P4/2P5/P4PPP/R1Bb1RK1 w - - 0 3",
"r2B2rk/2p2p2/p2p3p/1p1N4/3bP1n1/PB3P2/1P3P2/R3RK2 b - - 0 2",
"r5k1/ppp1p1rp/8/3P3b/4P3/2N5/PP1nN1P1/2K4R w - - 0 4",
"r5k1/ppN2pPp/6p1/5R2/1p6/1P2n3/P3K1PP/3R4 b - - 2 4",
"4br2/6k1/4pn1p/1p1P4/p2BB3/6P1/PP3P2/6K1 w - - 0 4"
]
},
{
name: "Counter Check Respond to a check with a check",
list: [
"",
"8/6P1/8/8/1q1QK3/8/8/k7 b - - 1 1",
"",
"8/8/8/8/8/1k6/2r5/K7 w - - 0 96",
"8/5Npp/p1P5/P1R3rk/1p4b1/3r2K1/4pP1P/7R w - - 0 34"
]
},
{
name: "Undermining Remove the defending piece",
list: [
"4rrk1/R5bp/3qp1p1/3p3Q/2pB1P2/6PP/1P3PB1/4R1K1 b - - 0 24",
"1b4k1/1p5p/8/1N1p4/P1nBn3/4P3/5q1N/5K1Q w - - 0 33",
"3qRrk1/1p3ppp/8/p4N2/8/P5QP/1P3PP1/6K1 b - - 0 1",
"1q3r1k/r4ppp/5Q2/8/5N2/p6R/PPP5/1K5R b - - 0 1",
"2q1rk2/1p3ppp/p7/2N5/1P6/5RP1/P1Q3KP/8 b - - 2 2"
]
},
{
name: "Clearance Get out of the way!",
list: [
"8/2k5/5Np1/1p4K1/5P2/8/1R6/3r4 b - - 0 58",
"8/k7/p1p5/2P1p3/1P6/P3PB2/3K4/6q1 w - - 0 50",
"1k1r3r/pp1b4/5Ppp/3p4/P2R4/3B2q1/2PB1PPP/R5K1 b - - 0 24",
"4k2r/1p6/2b1p1pp/2N1P2N/5P1Q/pPp5/Pn4PK/4R3 b - - 0 41",
""
]
},
{
name: "7th-Rank Rook Pawn And Passive Rook vs Rook",
list: [
"8/6k1/8/4K2p/4P2p/5P2/6P1/8 b - - 0 58",
"R7/P6k/r7/8/8/8/1K6/8 w - - 27 15",
"R7/P5k1/6P1/8/8/1K6/8/r7 b - - 22 14",
"8/R7/5k2/8/8/8/6K1/8 b - - 0 6",
"",
"",
"R7/P5k1/5P2/8/8/8/7K/r7 b - - 0 80",
"8/6k1/8/4K2p/4P2p/5P2/6P1/8 b - - 0 58",
"R7/P4k2/6p1/r3P2p/4K2P/6P1/8/8 b - - 1 62"
]
},
{
name: "Basic Rook Endgames Lucena and Philidor",
list: [
"",
"",
"",
"",
"8/8/8/3k4/8/7r/2K5/R7 b - - 9 11",
"",
"",
"8/8/8/8/R5K1/4k3/8/1r6 w - - 5 21",
"8/8/4K3/8/2k5/1R6/1p6/8 w - - 4 8",
""
]

}
]

module.exports = router;
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