:: Igo Hatsuyôron 120 (2015)

Variations of Our Solution (II)

This chapter explains all variations, as far as they do not relate specifically to the professional solution.

This continues the "Variations of Our Solution (I)" (180).


    Variation Tree    

(A) @ 217 ++Captures the right-hand stone in the upper right
(B) @ 218 ++Captures the left-hand stone in the upper right
(C) @ 219 + 2Starts the Crosscut Sequence
(A) @ 221 + 2Closes the upper left corner
@ 224 + 2Plays the guzumi "extra late"
@ 221Starts the Nakade Sequence on the left side
@ 222aa + 4 Gives atari at Black's single stone below
@ 221Gives atari at the nakade

Joachim's Ko-Semeai

(B) @ 225 ++ (Ko)Plays Joachim's hiki
(A) @ 236 ++Lives on the upper edge
(B) @ 237 ++ (Ko)Plays the kikashi in the top left corner first
@ 238 ++ (Ko)Cuts inside White's shape on the upper edge
@ 240 ++Plays the calm move in the centre
@ 238Reduces Black's eye from above
@ 237Plays from the right
@ 241 ++ (Ko)Occupies a shared liberty on the upper edge
@ 237Michael Redmond's kikashi in the bamboo joint
@ 225Plays on the left

(A) @ 243 ++Closes the upper left corner
(A) @ 244 ++Nozoki on the upper edge
(B) @ 245 + 3Lives on the upper edge
(.1) @ 246 + 3Michael Redmond's kikashi (Capture Variation)
@ 247 + 3Answers with the atari (three points, Capture Variation)
@ 246 + 6Answers with the solid connection
(.2) @ 248 ++Starts the Nakade Sequence on the left
@ 249 + 6Connects the centre stone (six points, Capture Variation)
@ 248Takes the guzumi point
@ 245Plays the guzumi (six points, Capture Variation)
(C) @ 250 ++ (Ko)Captures the nakade stones, leaves less ko-threats
(D) @ 251 ++ (Ko)Captures the nakade stones on the left
@ 253 ++ (Ko)Starts the ko-fight "early"
@ 251Starts the ko-fight "late"
@ 243Takes the guzumi point

(B) @ 255 ++ (Ko)Captures the right-hand stone first (move order)
(C) @ 257 ++ (Ko)Michael Redmond's kikashi
@ 259 + 10Pushes into Black's top left corner
@ 260 + 1Captures White's two stones in the upper right corner
@ 259Saves his nakade stones on the left
@ 257White connects with the atari ("early" ko)
(.1) @ 261 + 1White occupies the guzumi point
(.2) @ 264 + 5White plays nozoki on the first line
@ 257White takes a liberty of Black's Nakake stones
@ 267 ++Black cuts inside White's shape
@ 268 ++Black plays on the upper edge
@ 267Black secures his larger eye in the centre
@ 258Black plays from the left
@ 226Captures the left-hand stone in the upper right

(A) @ 270 ++Reduces Black's upper left corner
(.1) @ 271 ++Prevents Black's second eye
(.2) @ 272 ++Takes the guzumi point
@ 270Lives on the upper edge
@ 273 + 2Lives with his group in the upper right
@ 275 + 1Occupies a liberty of Black's nakade stones
@ 273Plays hane on the left edge
@ 276 + 2Connects in the upper left corner
@ 273Plays in the nakade
@ 278JigoThrows-in in the upper left corner
@ 280 + 1Plays a ko-threat
@ 278Captures Black's two stones in atari
@ 273Closes her territory on the left
@ 270Saves his nakade stones on the left side
@ 282 ++Occupies the guzumi point
@ 270Lives with her group on the left side

(B) @ 283 ++Tries to avoid the ko
(C) @ 284 ++Tries to avoid the ko
@ 227Takes the guzumi point
(A) @ 285 ++Tries to do without ko
(B) @ 286 ++Closes the upper left corner
@ 227Captures the right-hand stone in the upper right
@ 287 ++Atari and kikashi in the top left corner
@ 288 ++Returns to the ko variation
@ 290 ++Solidifies her eye-shape to the right
@ 288 ++Mistakenly follows the "usual" prodecure
@ 287 + 2Lives on the upper edge
@ 227Prevents two eyes for Black's large group
(.1) @ 292 ++Threatens to cut in the centre
@ 293 ++ (Ko)Occupies an outside liberty
@ 292Occupies a shared liberty
(.2) @ 295 ++ (Ko)Tries to do without throw-in in the centre
@ 228Throw-in in the centre

(A) @ 296 ++Strengthens the top left corner
(B) @ 297 ++ (Ko)Cuts inside White's shape
@ 299 ++Gives atari from below
@ 300 ++Captures Black's single stone in atari
@ 299Gives atari from the right in the top left corner
@ 297Solid move in the top left corner

(C) @ 301 ++Threatens White's eye from the right
@ 303 ++ (Ko)Cuts inside White's shape
@ 304 ++Gives atari from below
@ 304Threatens White's eye from the left
@ 301Plays on the edge
@ 305No resultPrevents Black's larger eye from below (triple ko)
@ 306 ++Destroys Black's eye
@ 305Defends her eye
@ 301Enlarges her eye
@ 307 ++ (Ko)Blocks from the top left corner (more threats)
@ 301Enlarges his eye
@ 228Threatens White's eye from the left

@ 309 ++ (Ko)White secures an eye on the right
@ 311 ++ (Ko)Black throws in inside White's eye
@ 309Black threatens from the right
@ 228White blocks to the left
@ 312 ++ (Ko)Does without Michael Redmond's kikashi in the bamboo joint
@ 316 ++Plays the solid move in the centre
@ 312Pushes into Black's eye from above
@ 317 ++Connects his partial groups on the left
@ 312Connects his partial groups on the right

@ 318 ++ (Ko)Plays sagari on the upper edge
@ 319 ++ (Ko)Reduces Black's eye from below (needs one "real" ko-threat)
@ 318Plays the solid move in the centre
@ 313Plays in the centre
@ 321 ++ (Ko)White plays inside Black's eye
@ 322 ++ (Ko)White gives atari in the centre
@ 321White continues with occupying liberties
@ 313White gives atari in the centre
@ 324 ++ (Ko)Captures White's stone in the centre
@ 325 ++ (Ko)Captures the ko on the upper edge
@ 327 ++ (Ko)Plays a ko-threat in the nakade
@ 325Plays the atari on the upper edge as a ko-threat
@ 324Connects the hanezeki's tail
@ 328 ++ (Ko)Occupies an outside liberty
@ 324Continues the semeai with Black's group on the lower edge
@ 313Plays sagari on the upper edge
@ 329 ++ (Ko)Plays the gote move in the hanezeki
@ 313Captures Black's stone on the upper edge
@ 330 ++ (Ko)Fills-in her second false eye (needs one "real" ko-threat)
@ 331 ++ (Ko)Occupies a shared liberty
@ 330Occupies an outside liberty
@ 314Occupies an outside liberty

@ 332 ++ (Ko)Occupies an outside liberty
@ 314Occupies a shared liberty
@ 333 ++ (Ko)Gives atari on the upper edge as a ko-threat
@ 314Connects the hanezeki's tail

@ 229Michael Redmond's kikashi in the bamboo joint
(.1) @ 334 ++ (Ko)Starts the ko "early"
@ 336(Ko)Does not recapture the ko (demonstration of ko option)
@ 334Recaptures the ko
(.2) @ 338 ++ (Ko)Does without atari and kikashi in the upper left corner
@ 339 ++Closes the top left corner
@ 338Occupies an outside liberty
@ 230Atari in the upper left corner
@ 340 ++ (Ko)Plays a solid block to defend the corner
(A) @ 342 ++ (Ko)Blocks from the left
(B) @ 343 ++Blocks from the right / above
@ 340Plays a Knight's move
@ 230Defends the upper left corner with a jump
(A) @ 345 ++ (Ko)Plays sagari on the upper edge
(B) @ 346 ++ (Ko)Tries to enlarge her eye
@ 230Atari on the upper edge

(A) @ 347 ++ (Ko)Plays from below to prevent Black's larger eye
(.1) @ 349 ++ (Ko)Threatens to cut from below
(.2) @ 350 ++ (Ko)Gives atari from the right (move order)
@ 347Throws-in to the left
@ 351 ++ (Ko)Fills-in her second false eye
@ 347Occupies an outside liberty
(B) @ , 352 ++ (Ko)Plays push and hane in the top left corner (kills left side)
@ 355 ++ (Ko)Gives atari from above (demonstration)
@ 353Gives atari from the right
@ 231Pre-empts another ko-shape in the centre
@ 356 ++ (Ko)Starts the ko in the upper right (move order)
@ 232Fills-in her first false eye
@ 357 ++ (Ko)Occupies an outside liberty
@ 358 ++ (Ko)Occupies another outside liberty (needs an own ko-threat)
@ 357Fills-in her second false eye
@ 232Occupies a shared liberty
@ 359 + 10Captures the hanezeki's tail (Ko)
@ 233Fills-in her second false eye
@ 361 ++ (Ko)Occupies an outside liberty (more threats)
@ 233Captures the ko
@ 362 ++ (Ko)Plays a ko-threat on the right side
@ 234Connects the hanezeki's tail

(C) @ 363 ++ (Ko)Capturs White at left (more threats)
@ 366 ++Connects solidly
@ 367 ++ (Ko)Plays atari in the corner
@ 366Connects her single stone in the corner
@ 369 ++Cuts inside White's eye
@ 366Plays from the outside
@ 363Connects diagonally
@ 370 ++ (Ko)Atari on the upper edge, to start a ko
@ 373 ++Connects solidly
@ 370Gives Counter-atari, to start a ko
@ 374 + 16Plays the guzumi
@ 370Cuts in the centre, as ko-threat
@ 376 +Atari in the hanezeki, as a ko-threat
@ 371Plays a ko-threat inside the hanezeki
@ 377 ++Does without Michael Redmond's kikashi in the bamboo joint
@ 371Michael Redmond's kikashi in the bamboo joint
@ 378 ++ (Ko)Starts the ko "early"
@ 371 ++ (Ko)Occupies an outside liberty
@ 364 ++ (Ko)Connects her single stone in the corner
@ 379 ++ (Ko)Oki on the left edge (more threats)
@ 379a ++ (Ko) Captures White's left-hand stone
(.1) @ 379b ++ Solid connection in the centre
(.2) @ 379c ++ Michael Redmond's kikashi in the bamboo joint
@ 379a Takes a White liberty in the centre
@ 379Kikashi in the top left corner
@ 364Kikashi on the upper edge
@ 380 ++ (Ko)Captures the left-hand stone first (more threats)
@ 364Captures the right-hand stone first

@ 381 ++Cuts inside White's eye
@ 364Pre-empts an eye in the centre
@ 382 ++Does without Michael Redmond's kikashi in the bamboo joint
@ 382a ++ (Ko) Pushes from above
@ 382 Gives atari in the centre immediately
@ 364 ++ (Ko)Michael Redmond's kikashi in the bamboo joint
@ 383 ++ (Ko)Starts the ko-fight "early"
@ 385 ++Ko-threat (for demonstrative purposes; plus six ko-threats)
@ 383Occupies an outside liberty
@ 364Occupies a shared liberty
@ 386 ++Connects the hanezeki's tail
@ 365Plays a ko-threat on the right side

@ 219Plays the guzumi "late"
@ 387 ++Connects the stone in atari
@ 219Lives in the upper right
@ 388 + 2Attacks Black's corner more aggressively
@ 220Pushes into Black's upper left corner
@ 389 + 5Saves his nakade stones
@ 220Closes the upper left corner

Michael Redmond's Kikashi

in the Bamboo Joint

(L) @ 390 + 1Michael Redmond's kikashi
(A) @ 392 + 3Answers with the solid connection
@ 396 + 2Continues with the Crosscut Sequence
@ 399 ++ (Ko)Plays Joachim's hiki on the upper edge
(.1) @ 401 ++ (Ko)Occupies outside liberty
(.2) @ 403 ++ (Ko)Plays hane on the upper edge
@ 399Connects the ko
@ 396Closes the upper left corner
@ 404 + 3Semeai Variation
@ 397Capture Variation
@ 392Plays the guzumi
@ 406 + 5Capture Variation
@ 393Semeai Variation
(B) @ 408 + 4Takes the guzumi point
@ 411 + 5Capture Variation
@ 409Semeai Variation
(C) @ 413 + 9Plays tenuki, and in the top left corner
@ 390Answers with the atari

@ 414 + 1Continues with the Crosscut Sequence
@ 415 ++ (Ko)Plays Joachim's hiki on the upper edge
@ 416 ++ (Ko)Immobilises Black's stones in the nakade
@ 418 ++ (Ko)Captures with less ko-threats for Black
@ 419 ++ (Ko)Two further ko-threats for Black (demonstration)
@ 418Connects the hanezeki's tail
@ 416 + 3Captures Black's nakade stones the "usual" way
@ 415 + 10Plays atari in Black's top left corner
@ 420 + 10Saves his nakade stones on the left edge
@ 415 + 2Lives with his group in the upper right
@ 414Closes the upper left corner
@ 421 + 3Takes the guzumi point
@ 414Plays the tsuke of Yamada Shinji in the upper left
@ 390Plays the guzumi
@ 422 + 6Connects her single stone in the centre
@ 390Continues with the endgame in the upper left corner
(.1) @ 425JigoConnects the hasami-tsuke stone
(.2) @ 426 ++Occupies a liberty on the left side
@ 429 + 1Plays endgame in the upper left
@ 426Occupies a liberty on the left side
@ 430 + 6Capture Variation
@ 427Semeai Variation (Demonstration only)
@ 391Plays endgame in the upper left
@ 197Plays the guzumi

White's Tenuki after Black's Guzumi

(S) @ 433 + 3 ≡≡Connects her single stone in the centre (move order)
(F) @ 434 + 5Wedges into Black's top left corner from below
@ 437 + 1Jumps onto the third line
@ 440 + 3Cuts on the left-hand side
(.1) @ 442 ++ (Ko)Connects solidly to the right
@ 444 ++ (Ko)Takes a liberty of White's stones in the corner
@ 442Gives atari on White's three stones
@ 446 ++ (Ko)Upper kikashi with the hanezeki's tail
@ 442Lower kikashi with the hanezeki's tail
@ 447 ++Dissolves the ko on the left side
@ 442Answers White's ko-threat
(.2) @ 449 ++ (Ko)Connects his single stone diagonally
@ 440Gives atari on White's cutting stone
@ 450 + 1Connects his single stone diagonally
@ 440Starts the Nakade Sequence on the left side
@ 437Starts to fix the shape on the left side
(.1) @ 451 + 7 (Ko)Plays sagari in the corner
@ 452 + 5 (Ko)Ignores White's ko-threat
@ 451Answers White's ko-threat
(.2) @ 453 ++Saves his single stone on the upper edge
@ 437Gives atari on White's cutting stone

@ 454 ++Gives atari on White's five stones at top left
(.1) @ 455 ++Lower kikashi with the hanezeki's tail
(.2) @ 456 ++Upper kikashi with the hanezeki's tail
(.3) @ 457 ++Captures White's single stone at top left
(.1) @ 458 ++Threatens to connect her groups
(.2) @ 459 ++Makes two eyes on the upper edge
@ 457Gives atari on the hanezeki's tail
@ 454Captures White's five stones
@ 437Secures two eyes for his large group in the upper right

@ 434Blocks solidly from the left
(A) @ 461 + 7Pushes further into Black's top left corner
(B) @ 462 + 6Saves her stones on the left side
@ 434Plays hane from the right
@ 463 + 5Plays hane on the upper edge
@ 435Enlarges her own territory on the top
@ 464 + 5Secures a point of territory in the centre first
@ 435Plays sagari on the upper edge

(L) @ 465 + 6Attacks Black's nakade stones on the left side
(A) @ 467 + 2Starts the Crosscut Sequence
(B) @ 468 ++Starts to attack White's group on the upper edge
@ 465Secures two eyes for his large group in the upper right
@ 469 + 6Starts the endgame at the upper edge
@ 470 + 1Blocks the top left corner
@ 469Saves his stones on the left edge
@ 465Captures Black's stones on the left edge
(H) @ 471 + 7Threatens to connect her groups
(B) @ 472 + 9Plays the tsuke on the second line
@ 473 ++Pre-empts Black's second eye in the upper right
@ 472Threatens to connect her groups
(C) @ 474 + 9Invades Black's corner deep on the second line
@ 475 ++Tries to capture White's invading stone
@ 474Gives way
(D) @ 476 + 9Plays a nozoki on the forth line inside Black's corner
@ 477 ++Pre-empts eyes for Black's top right group
@ 476Threatens to connect her groups

(A) @ 478 + 7Gives atari on Black's single stone on the upper edge
(E) @ 479 + >10Wedges on the forth line into Black's formation
(G) @ 480 + >10Gives atari on the hanezeki's tail
@ 481 + 7Saves his single stone on the upper edge
@ 480Saves his stones on the left edge
(J) @ 482 + >10Plays a nozoki from the right
(K) @ 483 + >10Connects her groups on the sixth line
(.1) @ 484 ++Threatens to capture Black's stones on the left edge
(.2) @ 485 ++Plays a nozoki on the forth line inside Black's corner
@ 483Gives atari on Black's single stone on the upper edge
(N) @ 486 ++Gives atari from above on Black's stone in the lower left corner
(P) @ 487 ++Connects her left-hand side groups diagonally
(Q) @ 488 + >10Plays a bamboo joint in the top left centre
(R) @ 489 ++Plays a diagonal move in the top left centre
(A) @ 490 ++Attempts to capture Black's two stones
(B) @ 491 ++Defends her territory in the top right corner
@ 489Threatens to capture Black's two stones
@ 198Answers the guzumi locally

Copyright © 2020 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

L e g a l   n o t i c e