In the second link from Wes' answer, the joint work of Yakov Konoval and Marc Bourzutschky is mentioned in passing, though not described at all, so I thought I'd give them a shout out here, as they have done a lot of work in particular 7-man endgames. This includes impressive work on pawnless endings, such as showing that in this position, where it is Black to move, White wins in 330 moves with best play:

[FEN "1k6/1b5q/N7/8/8/1Q6/8/B1K5 b - - 0 1"] 1...Ka8 2.Nb4! Qh1+ 3.Kb2! Qg1 4.Qa4+! Qa7 5.Qe8+! Qb8 6.Qe1 Bf3 7.Kb1! Qf4 8.Qe8+! Qb8 9.Qe7 Qf4 10.Qd8+ Qb8 11.Qd2 Be4+ 12.Kc1! Qg3 13.Qd4! Qf4+ 14.Kb2! Qf3 15.Qd8+ Kb7 16.Qe7+! Ka8 17.Qe8+ Ka7 18.Qe5 Kb6 19.Ka2! Qf7+ 20.Ka3 Qa7+ 21.Kb2 Bh7 22.Qf6+! Kb5 23.Nd5! Ka5 24.Qc3+ Kb5 25.Nc7+ Kb6 26.Ne6 Qa5 27.Qe3+! Kb5 28.Nd4+ Kc4 29.Nb3! Qd5 30.Qc3+ Kb5 31.Qa5+! Kc6 32.Qa8+! Kd6 33.Qf8+ Kc7 34.Qg7+ Qd7 35.Qg1 Qe7 36.Ka2! Qe2+ 37.Bb2! Qa6+ 38.Ba3! Qe2+ 39.Ka1 Qd3 40.Qc1+! Kd8 41.Nc5! Qd5 42.Na4! Qd4+ 43.Nc3! Kd7 44.Qe1! Bg8 45.Qe7+! Kc6 46.Bb2 Bc4 47.Nb1! Qd6 48.Qe4+ Qd5 49.Qe8+! Qd7 50.Qe1 Qd3 51.Qh1+ Bd5 52.Qh6+! Kd7 53.Qg7+! Kc6 54.Qf6+ Kb7 55.Qe7+ Kc6 56.Bc3 Be4 57.Qe6+ Kc5 58.Qc8+ Kb6 59.Nd2 Bf5 60.Qb8+! Kc6 61.Qa8+! Kc5 62.Qa7+ Kc6 63.Qa4+ Qb5 64.Qa8+ Kd7 65.Qf3 Qa4+ 66.Kb2 Qc2+ 67.Ka3! Be6 68.Qb7+! Ke8 69.Qa8+ Kf7 70.Qf3+ Ke8 71.Qe3 Qa2+ 72.Kb4 Qd5 73.Be5! Qc6 74.Bd4 Kd7 75.Bc5! Qd5 76.Kc3! Qa2 77.Qe4 Qa5+ 78.Bb4! Qd5 79.Qh7+ Bf7 80.Qg7 Qa2 81.Qd4+ Qd5 82.Qa7+ Kc8 83.Qa6+ Kc7 84.Ba5+ Kb8 85.Qb6+ Ka8 86.Qc7 Qb7 87.Qc5 Bd5 88.Qf8+ Qb8 89.Qf5 Qd6 90.Bb4 Qc6+ 91.Kb2 Be6 92.Qa5+ Kb7 93.Bc5 Qa6 94.Qc3 Qc6 95.Qb4+ Ka6 96.Qa3+ Kb7 97.Bg1 Kc7 98.Qe7+ Qd7 99.Qb4 Qd5 100.Kc1 Qc6+ 101.Kd1! Kd7 102.Qd4+ Qd5 103.Qa7+ Kc8 104.Qa4 Qe5 105.Bb6 Qh5+ 106.Kc1 Qe5 107.Bf2 Bd5 108.Qa6+ Kd8 109.Qa3 Kd7 110.Qd3 Qc7+ 111.Kd1 Qd6 112.Bg3 Qc6 113.Qd4 Ke6 114.Bf4 Kf7 115.Be5 Ke6 116.Bh8 Ke7 117.Qb4+ Ke8 118.Be5 Qb7 119.Qc5 Qc6 120.Qa3 Qh6 121.Bc3 Qc6 122.Qa5 Kd7 123.Kc1 Be6 124.Qe5 Qh1+ 125.Kc2 Qd5 126.Qg7+ Bf7 127.Qg3 Qd6 128.Qe3 Bd5 129.Kd1 Qe6 130.Qd4 Kc8 131.Qh8+ Qg8 132.Qf6 Qg4+ 133.Kc1 Qe6 134.Qf8+ Kb7 135.Nf1 Qe4 136.Qc5 Qc4 137.Qe7+! Qc7 138.Qb4+ Qb6 139.Qf8 Qg1 140.Qe7+ Kc6 141.Qf6+ Kd7 142.Kc2 Qg2+ 143.Nd2 Be6 144.Qh6 Qd5 145.Kd1 Qc5 146.Qg7+ Ke8 147.Kc2 Qf5+ 148.Kc1 Qc5 149.Qg6+ Kd7 150.Qd3+ Qd6 151.Qe4 Qa3+ 152.Kc2! Qa2+ 153.Kd1 Qd5 154.Qe3 Qd6 155.Qa7+ Qc7 156.Qd4+ Qd6 157.Qg7+ Qe7 158.Qg1 Kc8 159.Qg6 Qd6 160.Qg7 Qf4 161.Kc1 Qe3 162.Qf6 Kd7 163.Bb4 Kc8 164.Kc2 Kb7 165.Bc3 Bd5 166.Be5 Qc5+ 167.Kd1 Kc8 168.Qf5+ Kd8 169.Nf1 Qg1 170.Bf6+ Kc7 171.Kd2! Qg2+ 172.Ke3! Bc6 173.Nd2! Qg3+ 174.Ke2 Qh2+ 175.Kd1 Qh1+ 176.Kc2 Qd5 177.Qf4+ Kc8 178.Bd4 Qe6 179.Kd1 Bd5 180.Be5 Qb6 181.Qf5+ Qe6 182.Qg5 Qg8 183.Qf4 Qg1+ 184.Ke2 Qg2+ 185.Kd3 Qg6+ 186.Kd4 Bf7 187.Ne4 Qg1+ 188.Kd3 Qd1+ 189.Ke3 Qe1+ 190.Kf3 Qf1+ 191.Nf2! Qc4 192.Qf6 Qe6 193.Qh8+! Qe8 194.Qg7 Qd8 195.Ke2! Qe7 196.Qh8+ Qe8 197.Qh3+ Qe6 198.Qe3! Qb3 199.Qc5+! Kb7 200.Qe7+! Ka6 201.Kd2! Bg6 202.Qc5 Qb6 203.Qc4+! Qb5 204.Qc8+ Qb7 205.Qc3 Qd5+ 206.Ke3! Kb5 207.Qb2+! Kc6 208.Kf4! Qc4+ 209.Kg3! Bc2 210.Kh2 Kd7 211.Qb7+ Ke6 212.Bg3! Bf5 213.Qg7! Qc8 214.Bh4 Qb8+ 215.Kg1 Qe5 216.Qe7+ Kd5 217.Qf7+ Kc6 218.Qb3 Qd4 219.Bg3 Bd7 220.Qb1 Be6 221.Qg6 Kd7 222.Qh7+ Kc6 223.Qc7+ Kb5 224.Qb7+! Qb6 225.Qe4 Bb3 226.Bf4 Qc6 227.Qh7 Qf3 228.Qd7+! Qc6 229.Qg7 Qc5 230.Kg2 Be6 231.Qb2+ Kc6 232.Qe2 Bf5 233.Qe8+ Kb7 234.Kg3 Qc3+ 235.Kh2! Qf6 236.Qb8+ Kc6 237.Qc7+ Kd5 238.Kg1! Qg6+ 239.Bg3! Qf6 240.Qc1 Qd4 241.Qh6 Bd7 242.Qa6 Bc6 243.Qe2 Kc5 244.Be5 Qc4 245.Nd3+! Kb5 246.Qb2+! Ka4 247.Nf4 Qb3 248.Qd4+ Qb4 249.Qa1+ Qa3 250.Qe1 Qf3 251.Kh2! Bb7 252.Qd2 Kb5 253.Bf6 Ka6 254.Be7 Bc6 255.Bc5 Kb7 256.Qb2+ Kc8 257.Qf6 Kb7 258.Qe7+ Kc8 259.Qd6 Kb7 260.Bd4 Ka6 261.Qc7 Kb5 262.Qb6+ Kc4 263.Be3 Kc3 264.Qd4+ Kb3 265.Qd3+ Ka4 266.Qc4+ Ka5 267.Bc5 Qe4 268.Qc3+ Kb5 269.Bd6 Qc4 270.Qe3 Bd7 271.Qd2 Bc6 272.Kh3 Ka6 273.Be5 Bb5 274.Bd4 Qf7 275.Kg3 Qg8+ 276.Kf3 Qb3+ 277.Be3 Kb7 278.Kf2 Kc8 279.Qd6 Qa2+ 280.Kf3 Qc4 281.Qf8+ Kb7 282.Kg3 Qc7 283.Qh8 Qe7 284.Qd4 Qg5+ 285.Kf3 Qf5 286.Qb6+ Kc8 287.Bd4 Qd7 288.Kg3 Qc6 289.Qa7 Qb7 290.Qc5+ Qc6 291.Qf5+ Qd7 292.Qe5 Qe8 293.Ne6 Qg6+ 294.Kf3 Qd3+ 295.Kf4 Qd2+ 296.Kg3! Qd3+ 297.Be3 Qg6+ 298.Ng5 Qe8 299.Qd4 Qd7 300.Qb4 Qd5 301.Bf4 Bc6 302.Qf8+ Kd7 303.Qg7+ Ke8 304.Qc7 Qg2+ 305.Kh4 Qh1+ 306.Bh2 Qd5 307.Kh5 Bd7 308.Bd6 Qh1+ 309.Kg6 Qc6 310. Qb8+! Bc8 311.Qb4! Qd5 312.Qb6 Qf5+ 313.Kh5! Qg4+ 314.Kh6 Qh4+ 315.Kg6! Qc4 316.Kf6 Qf1+ 317.Kg7! Qf5 318.Qe3+! Kd7 319.Nf7 Kc6 320.Qc1+ Kb5 321.Ne5 Be6 322.Qc6+ Ka5 323.Qa8+ Kb6 324.Qb8+ Ka6 325.Bc7 Qg5+ 326.Ng6! Qe3 327.Qa8+ Kb5 328.Qe8+ Ka6 329.Kf6 Qc3+ 330.Be5!

I'm sure that appears complicated enough, but to really get a sense as to how complicated the optimal play is from the initial position, note that every move annotated with ! above is an only-winning move, i.e. any other move would allow a draw against best play from Black.

They later showed that this position - again with Black to move and with ! indicating an only-winning move - is a win for White in 517 moves:

[FEN "8/1r6/8/6n1/5k2/1b6/3K3N/7Q b - - 0 1"] 1...Rd7+ 2.Kc3! Bd1 3.Qf1+! Bf3 4.Qc1+! Kf5 5.Kb2! Rb7+ 6.Ka3 Ra7+ 7.Kb4 Rb7+ 8.Ka5 Ra7+ 9.Kb6 Rb7+ 10.Ka6 Re7 11.Qf1 Re6+ 12.Ka7 Re7+ 13.Kb8 Re8+ 14.Kc7 Re3 15.Kc8 Rc3+ 16.Kb8! Kf4 17.Qg1! Ne4 18.Nf1! Rb3+ 19.Ka7! Rd3 20.Qh2+! Kf5 21.Kb8 Nf6 22.Nd2! Bd5 23.Qf2+! Ke5 24.Qe2+ Kd4 25.Ka7 Nd7 26.Qg4+! Kc5 27.Qg1+! Kb4 28.Qb1+! Kc3 29.Qc1+ Kd4 30.Qb2+ Kc5 31.Qc2+! Kd4 32.Qa4+ Kc5 33.Qa5+ Kd4 34.Qb4+ Ke5 35.Ka6 Kf5 36.Qb1 Ne5 37.Kb5! Bc6+ 38.Kb4! Bd5 39.Qf1+ Kg6 40.Qe2 Kf6 41.Qh5 Ke6 42.Qg5 Nc6+ 43.Kb5 Ne5 44.Qh6+ Kf5 45.Nf1 Bc6+ 46.Kb4 Rd4+ 47.Kb3 Rd3+ 48.Ka2 Bd5+ 49.Kb1! Nc4 50.Qh5+! Kf6 51.Qh4+ Ke6 52.Ng3! Rb3+ 53.Kc1! Rc3+ 54.Kd1 Re3 55.Nf1! Ra3 56.Qf4 Kd7 57.Ke1 Kc6 58.Qh6+ Kc5 59.Kf2 Rb3 60.Qh8 Ra3 61.Qb8 Kc6 62.Qb1 Rc3 63.Kg1 Ra3 64.Qc2 Kb6 65.Qf5 Kc5 66.Qf8+ Kb5 67.Qe8+ Kc5 68.Qe2 Rf3 69.Qe7+ Kd4 70.Qg7+ Kc5 71.Qg5 Kc6 72.Qh4 Kb5 73.Qe7 Kb6 74.Qb4+ Kc6 75.Qe1 Ra3 76.Qf2 Rf3 77.Qd4 Kd6 78.Qh4 Kc5 79.Nh2 Ra3 80.Ng4 Ra1+ 81.Kf2! Ra2+ 82.Kg3! Ra3+ 83.Kf4 Rf3+ 84.Kg5 Be6 85.Nf6! Ne5 86.Nh5 Rf5+ 87.Kh6 Ng4+ 88.Kg6! Ne5+ 89.Kh7 Rf7+ 90.Kh6! Ng4+ 91.Kg5 Ne5 92.Qa4 Rf5+ 93.Kh6! Bc4 94.Qa5+ Kd4 95.Qb6+ Kd5 96.Qd8+ Ke4 97.Qd1 Ke3 98.Qc1+ Kd4 99.Ng3 Rf6+ 100.Kh5 Kd5 101.Kh4 Rg6 102.Kh3 Bd3 103.Qf4 Rg8 104.Qb4 Bc4 105.Qd2+ Ke6 106.Qh6+ Kd5 107.Qh7 Kc5 108.Kh2 Rg6 109.Qe7+ Kd5 110.Qd8+ Ke6 111.Qf8 Kd5 112.Kh3 Bb5 113.Qa3 Bc6 114.Kg2 Rf6 115.Kh2 Nf3+ 116.Kh3 Rh6+ 117.Kg2! Nd4 118.Qe7 Kc4+ 119.Kg1! Rg6 120.Qf7+ Re6 121.Qf4 Kd3 122.Qf1+ Kc3 123.Qc1+ Kb4 124.Kh2 Rf6 125.Kh3 Bd7+ 126.Kg2! Bc6+ 127.Kh2 Rf3 128.Qd1 Kc5 129.Nh5 Kd5 130.Qh1 Ke6 131.Qg1 Ke5 132.Qg7+ Ke4 133.Qc7 Kd5 134.Nf4+ Kc4 135.Qb8 Rc3 136.Qa7 Be4 137.Qb6 Bc6 138.Qa6+ Kc5 139.Nd3+ Kd6 140.Nb2 Rb3 141.Nd1 Nf3+ 142.Kg3 Nd4+ 143.Kf2 Rf3+ 144.Ke1 Kd5 145.Qb6 Kc4 146.Qa7 Bb5 147.Nf2 Nc2+ 148.Kf1 Bc6 149.Qa6+ Kc5 150.Qa2 Nd4 151.Kg1! Rf5 152.Kh2 Rh5+ 153.Kg3! Rg5+ 154.Kf4! Rf5+ 155.Kg4 Bf3+ 156.Kh4 Rh5+ 157.Kg3 Rg5+ 158.Kf4 Rf5+ 159.Ke3! Re5+ 160.Kd3 Be2+ 161.Kd2! Kb4 162.Qg8 Bb5 163.Qg4 Re2+ 164.Kc1! Kc4 165.Nd1! Rc2+ 166.Kb1 Rd2 167.Qc8+ Bc6 168.Qg8+! Kb4 169.Nb2 Be4+ 170.Ka2! Nb5 171.Qb3+! Ka5 172.Ka1! Bd5 173.Qa4+! Kb6 174.Qb4! Rd4 175.Qe1 Be4 176.Nd1 Rc4 177.Qe3+ Kc6 178.Kb2 Rc2+ 179.Kb3 Nd6 180.Qh6 Rc5 181.Nc3 Bd5+ 182.Kc2 Kd7 183.Qg7+ Kc6 184.Kd1 Bf7 185.Kd2 Bc4 186.Ke1 Ra5 187.Qf6 Rf5 188.Qg6 Kc7 189.Qg7+ Rf7 190.Qg3 Kc6 191.Qg2+ Kc7 192.Qh2 Kc6 193.Qh1+ Kc5 194.Qh8 Re7+ 195.Kd1! Re8 196.Qh2 Re3 197.Kc2 Rd3 198.Qe5+ Kc6 199.Qh5 Rg3 200.Qa5 Rh3 201.Kd2 Rh2+ 202.Ke3 Rh3+ 203.Kf4 Rd3 204.Na4 Rd4+ 205.Kf3 Rd3+ 206.Kg4 Rd4+ 207.Kh3 Ne4 208.Qa7 Be6+ 209.Kg2! Rb4 210.Qa6+! Kd5 211.Kf3 Kd4 212.Qe2 Kd5 213.Ke3 Bd7 214.Nb2 Bb5 215.Qh5+ Ke6 216.Nd1 Nf6 217.Qh3+ Kf7 218.Kd2 Rd4+ 219.Kc1 Rc4+ 220.Kb2 Rb4+ 221.Ka3 Ra4+ 222.Kb3 Rd4 223.Nc3 Bc4+ 224.Kc2! Be6 225.Qe3 Rh4 226.Qa7+ Kg6 227.Ne2 Rb4 228.Kc1 Rc4+ 229.Kb2 Rb4+ 230.Ka3 Rb3+ 231.Ka4! Rf3 232.Qd4 Bd7+ 233.Kb4 Be6 234.Qc5 Bd7 235.Qd6 Bg4 236.Nd4 Rd3 237.Kc4 Re3 238.Nc6 Bc8 239.Qh2 Re4+ 240.Kc5 Bb7 241.Qg1+ Kh7 242.Na7 Rg4 243.Qh2+ Kg6 244.Nb5 Rg2 245.Qh3 Rg5+ 246.Kb4 Bg2 247.Qh2 Bd5 248.Nd6 Ne4 249.Nc8 Nf6 250.Qd6 Rh5 251.Qc7 Kg5 252.Qe5+ Kg6 253.Qe3 Kh7 254.Qd3+ Kg7 255.Nd6 Rg5 256.Ka4 Rh5 257.Qg3+ Kh7 258.Kb4 Kh6 259.Ka3 Rg5 260.Qc3 Kg6 261.Qc2+ Kh6 262.Nf5+ Kh5 263.Qd3 Kg6 264.Ng3+ Kf7 265.Qe3 Rg8 266.Nf5 Ra8+ 267.Kb2! Ra2+ 268.Kb1 Ra6 269.Qe7+ Kg6 270.Nd6 Rb6+ 271.Kc2 Rb3 272.Qe5 Rf3 273.Kd2 Bc6 274.Nc4 Bd5 275.Ne3 Be4 276.Ng4 Bb7 277.Qe6 Kg5 278.Ne5 Rf2+ 279.Kc3 Rf4 280.Nf7+ Kg6 281.Nd6 Be4 282.Kd2 Rf2+ 283.Ke1 Rf4 284.Qc4 Kg5 285.Qe2 Bg6 286.Qe5+ Kg4 287.Ke2 Bf5 288.Qa1 Nh5 289.Ke3 Bc2 290.Qa8 Bg6 291.Qd5 Ng3 292.Nc4 Nf5+ 293.Ke2! Ng3+ 294.Kd2 Kh3 295.Qc6 Re4 296.Qa6 Re2+ 297.Kc3 Be4 298.Qd6 Kg2 299.Kb4 Bf3 300.Ka5 Nf5 301.Qc5 Be4 302.Kb6 Rc2 303.Qb4 Kf2 304.Ne5 Ke3 305.Nd7 Nd4 306.Qa3+ Ke2 307.Ne5 Nf5 308.Qa6+ Kf2 309.Qa4 Ng3 310.Qb4 Ke3 311.Nc4+ Kd3 312.Nd6 Ke3 313.Ka7 Bd3 314.Qb6+ Kf3 315.Qd4 Be4 316.Kb8 Re2 317.Nf7 Bf5 318.Ng5+ Kg2 319.Qd5+ Be4 320.Qb3 Bf5 321.Qf3+ Kh2 322.Qb7 Re8+ 323.Ka7! Re2 324.Qd5 Rf2 325.Nf3+ Kg2 326.Nd2+ Kh3 327.Qc6 Kg4 328.Qc3 Rf4 329.Nc4 Re4 330.Ne3+ Kg5 331.Qc5 Re6 332.Kb8 Re8+ 333.Kb7 Re6 334.Kc7 Re4 335.Kc6 Re8 336.Kb6 Re4 337.Ka5 Re6 338.Kb5 Re4 339.Nd5 Nh5 340.Ne7 Ng3 341.Qc1+ Kh4 342.Qh6+ Kg4 343.Nd5 Kf3 344.Qf6 Kg4 345.Qg7+ Kf3 346.Qc3+ Kf2 347.Qc5+ Kf3 348.Ka5 Bg4 349.Nf6 Rf4 350.Qc6+ Kf2 351.Nd5 Re4 352.Qf6+ Bf3 353.Nf4 Ne2 354.Nd3+ Ke3 355.Ne5 Rf4 356.Qb6+ Nd4 357.Kb4 Ke4 358.Nc4 Kf5 359.Qh6 Be2 360.Ne3+ Ke5 361.Qh8+ Ke4 362.Qe8+! Kf3 363.Nd5! Re4 364.Qf7+ Kg3 365.Qg6+ Kf3 366.Nf6 Rf4 367.Qh5+ Kg3 368.Qg5+ Kf3 369.Kc3 Nb5+ 370.Kb3! Rc4 371.Nd5 Nd4+ 372.Kb2 Rc2+ 373.Kb1 Ke4 374.Nf6+ Kd3 375.Nd7 Bf3 376.Ne5+ Ke2 377.Qh4 Rd2 378.Nc4! Rd1+ 379.Kb2! Rd3 380.Qg5 Rb3+ 381.Ka2! Rd3 382.Qe5+ Kf2 383.Nb2 Rd2 384.Qf4 Ke2 385.Kb1 Bg2 386.Nc4 Rd3 387.Qh2 Kf1 388.Qh7 Rc3 389.Kb2 Rc2+ 390.Ka3 Rc3+ 391.Kb4 Ne2 392.Ne5 Rh3 393.Qf5+ Ke1 394.Nd3+ Kd2 395.Nc5 Rg3 396.Qh7 Ke3 397.Qd3+ Kf2 398.Qc4 Rc3 399.Qh4+ Rg3 400.Ka5 Kg1 401.Qe7 Kf2 402.Qf6+ Ke1 403.Qh4 Kf1 404.Qd8 Ke1 405.Nd3+ Kd2 406.Nb4+ Kc1 407.Qe7 Kd2 408.Qd6+ Ke3 409.Nc2+ Kf2 410.Qe7 Rf3 411.Qh4+ Rg3 412.Ka6 Bh3 413.Qf6+ Rf3 414.Qa1 Rd3 415.Qe1+ Kf3 416.Qb4 Kg3 417.Qe7 Kf2 418.Ka5 Rc3 419.Qf8+ Rf3 420.Qb4 Rc3 421.Qb6+ Kg3 422.Ne3 Nf4 423.Nc4 Rf3 424.Qc7 Rf2 425.Qg7+ Kh2 426.Qe5 Kg3 427.Qg5+ Kh2 428.Kb6 Bg2 429.Ne3 Bh3 430.Qe5 Kg3 431.Nd5 Kg4 432.Qd4 Kg3 433.Qe3+ Rf3 434.Qe5 Kg4 435.Nf6+ Kg3 436.Ne4+ Kg2 437.Qc5 Ne2 438.Qc4 Nf4 439.Qc2+ Kh1 440.Qc5 Bg2 441.Nf2+ Kh2 442.Ng4+ Kh3 443.Qg5 Rb3+ 444.Ka5 Ra3+ 445.Kb4 Rf3 446.Ne5 Nd5+ 447.Kb5 Rf4 448.Kc5 Be4 449.Nc6 Rh4 450.Qd2 Kg4 451.Qe1 Bg2 452.Qe6+ Kg3 453.Nd4 Nf4 454.Qb3+ Kh2 455.Qe3 Rh5+ 456.Kd6! Rd5+ 457.Ke7! Nh3 458.Qd2 Kg3 459.Qc3+ Kh2 460.Qe3 Rg5 461.Qe2 Nf4 462.Qf2 Rg4 463.Nf5 Nd5+ 464.Ke6 Rg6+ 465.Kd7 Rg4 466.Qe1 Nf6+ 467.Kc7 Ne4 468.Qc1 Rg5 469.Qf4+! Kg1 470.Ne3 Rg7+ 471.Kb6 Rg6+ 472.Ka5 Rg5+ 473.Kb4 Rg6 474.Qe5 Bf3 475.Qa1+ Kh2 476.Qb2+ Kh1 477.Qc1+ Rg1 478.Qc8 Rg3 479.Qh8+ Kg1 480.Qa1+ Kf2 481.Qd4 Rg5 482.Nf5+ Kg2 483.Qb2+ Kh3 484.Ne3 Rh5 485.Nf1 Kg4 486.Qg7+ Kh3 487.Qg1 Rh4 488.Ka3 Rf4 489.Qh2+ Kg4 490.Ne3+ Kg5 491.Nd5 Rf7 492.Qe5+ Kh4 493.Ne7 Ng5 494.Ng8 Ne4 495.Nh6 Rf6 496.Nf5+ Kg4 497.Ne3+ Kh4 498.Kb4 Rb6+ 499.Ka5 Rf6 500.Qh2+ Kg5 501.Qh7 Ng3 502.Qg7+ Rg6 503.Qe5+ Kh6 504.Qf4+ Rg5+ 505.Kb6 Be2 506.Qf8+ Kh7 507.Nd5 Bc4 508.Nf6+ Kg6 509.Nd7 Nh5 510.Qd6+ Kh7 511.Qe7+ Kh6 512.Qe3 Be6 513.Ne5 Bd5 514.Qd4 Bg8 515.Qd2 Nf6 516.Nf3 Nd5+ 517.Kb7 Kg7 518.Qxg5+

Note: "win for white in X moves" here means that, assuming perfect play, it will take X moves for white to reduce the position to a won 6 piece endgame (for which there are complete tablebases available). It doesn't mean it's X moves until mate. So in the longer example here, for instance, no capture is made until exactly move 517, when a winning 6 piece endgame is reached.

In a post from 2006, Bourzutschky himself gives an account of some of their work involving 7-man endings with pawns.