US Open 1997 – MIRV’s and Best Balls

The final chapter in disentanglement is almost as complicated as the topic of entanglement in Quantum Mechanics.

Actually more so, as quantum entanglement is really an over-inflated term designed to make things more mysterious than they really are. Ah, but I best try to stay on topic…

The problem at hand is to try to understand what is going on for players who have multiple entries in the USCF Swiss xtab. Most of these players have two entries, although D. J. Eamus, Jr. actually has three entries.

One thing that might be going on is the player was in the “Best Ball” section. Which meant they played both the EB and TR sections for R1-6. In other words, both the am/pm sessions, with two slow time control games / day. After six rounds they picked the section where they had the best score, and proceeded on with the TR section to completion.

The other possibility, is that the player began in a certain section, but decided to drop out for some reason, typically because they felt their score could be improved (or perhaps because they desired to play more games).  In fact, it was possible to play out the entire R1-6 in the BB section and then drop both scores to reenter in the D5 section. This is exactly what D. J. Eamus, Jr. did – who was the only player with a triple entry.

Thank goodness <Phony> pointed both the possibility and its realization to me, else I could have been confused for days.

To sort out these multiple entries I wrote a little routine where I matched a player against the groups they played in:

>>> dReport()

Kaufman, Lawrence Charles           19 -  10 / 151     463 -   1 / 156
Shahade, Greg                       22 -  10 / 151     502 -   1 / 156
Celorio, Edward J                   58 -   2 / 151     464 -   1 / 156
Kahane, Gabe                       122 -  10 / 151     429 -   1 / 156
Schreiber, Edwin Z                 136 -  10 / 151     503 -   2 / 151
Hayes, Rea B                       138 -   2 / 151     526 - 526 /   2
Schadler, Peter F                  234 -   2 / 151     534 - 526 /   2
Rubenstein, Jeff                   239 -   1 / 156     465 -  10 / 151
Spencer, James                     262 -  10 / 151     521 -   2 / 151
Wheeler, Jerry T                   270 -   2 / 151     510 -   1 / 156
Caplan, Scott                      343 -  10 / 151     520 -   2 / 151
Markowski, Alina F                 354 -  24 /  25     515 -   1 / 156
Doredant, Richard                  403 -   2 / 151     514 -   1 / 156
Eamus Jr, D J                      446 -  10 / 151     524 -   1 / 156     532 -  24 /  25
Ashbaugh Jr, Douglas Leroy         466 -   1 / 156     504 -  24 /  25
Angel, Antonio                     480 -   1 / 156     512 -  24 /  25
Bowen, Donald E                    483 -  10 / 151     516 -   1 / 182
Borders, Ronald A                  505 -   1 / 156     525 -  24 /  25

The lower numbered index represents the section with the “official” tournament score for the player.  The groups are enumerated by the section leader,

TR   1  Yermolinsky
EB  24  Curdo
D8   2  Ivanov
D5  10  Reprintsev

Using these keys allows me to rewrite the dReport, where I sorted the players according to category:

BB - Best Ball

Ashbaugh Jr, Douglas Leroy    TR / EB         466 / 504
Angel, Antonio                TR / EB         480 / 512
Borders, Ronald A             TR / EB         505 / 525
Markowski, Alina F            EB / TR         354 / 515


MIRV's - Reentrants of all varieties

Kaufman, Lawrence Charles     D5 / TR          19 / 463
Shahade, Greg                 D5 / TR          22 / 502
Kahane, Gabe                  D5 / TR         122 / 429
Bowen, Donald E               D5 / TR         483 / 516

Celorio, Edward J             D8 / TR          58 / 464
Wheeler, Jerry T              D8 / TR         270 / 510
Doredant, Richard             D8 / TR         403 / 514
 
Schreiber, Edwin Z            D5 / D8         136 / 503
Spencer, James                D5 / D8         262 / 521
Caplan, Scott                 D5 / D8         343 / 520
Rubenstein, Jeff              TR / D5         239 / 465 

Eamus Jr, D J                 D5 / TR / EB    446 / 524 / 532 

Hayes, Rea B                  D8 / 526        138 / 526 
Schadler, Peter F             D8 / 526        234 / 534

Again we encounter the unique <Hayers // Schadler> R1 pairing which is still not exactly understood, and so best ignored for the moment.

Let’s consider Schreiber, Spencer and Caplan, who all dropped out of the D8 section to play the D5. All of them dropped out of the D8 by Monday, and so were free for the D5. E.g. here is Schreiber’s D8 scoring:

503. Edwin Z Schreiber  (1975)      2.5 / 12    ( +2 =1 -3 )

    1    1.0   X     -   Forfeit
    2    1.0   L    34   Lugo, Blas                       2529    2.0
    3    1.5   D   297   Cohen, William                   1706    1.5
    4    1.5   L   228   Clifford, Bryan E                1805    2.5
    5    2.5   W   373   Turner, Adam                     1242    2.0
    6    2.5   L   152   Fernandez, David                 1694    3.5
    7    2.5   U     -   bye
    8    2.5   U     -   bye
    9    2.5   U     -   bye
   10    2.5   U     -   bye
   11    2.5   U     -   bye
   12    2.5   U     -   bye

Final rating: 1914  (-61)      Average Opp Rating: 1795

Schrieber played full sessions on Friday, Saturday and Sunday. But scoring less than 50% decided to drop the section in order to reenter in Monday’s D5. It paid off, as he scored 3.5/6 to improve his start to above 50%.

Another interesting case is that of <Rubenstein>, who surprisingly dropped out of the D5 section to rejoin the TR section. How is that possible? Let’s look at his pairings, first his D5 section results:

>>> score( 465 )

465. Jeff Rubenstein  (1875)      3.5 / 12    ( +3 =1 -4 )

    1    1.0   W   489   Levine, Adam                     1224    0.0
    2    1.0   L    10   Reprintsev, Alexandr V           2529    2.0
    3    1.5   D   436   French, Stanley R                1475    1.5
    4    1.5   L   202   Donald, Ross B Mac               1763    2.0
    5    2.5   W   428   Saverin, Eduardo                  650    2.0
    6    2.5   L   208   Cenzer, Michael R                1513    3.5
    7    3.5   W   366   Marks, Thomas D                  1288    3.0
    8    3.5   L   263   Peavey, Martin Jeffery           1550    4.5
    9    3.5   U     -   bye
   10    3.5   U     -   bye
   11    3.5   U     -   bye
   12    3.5   U     -   bye

Final rating: 1765  (-110)      Average Opp Rating: 1499

We expect him to drop the final four rounds since he kept the TR section results. But it is interesting to see that he played the entire 8 games belonging to the D5 section, i.e. all of Monday and Tuesday am.

Let’s examine his TR section results:

>>> score(239 )

239. Jeff Rubenstein  (1875)      6.0 / 12    ( +5 =2 -5 )

    1    0.0   L    60   Balje, Jan                          0    1.0
    2    0.5   D   364   Biezunski, Emanuel P             1411    0.5
    3    1.5   W   437   Dautremont, James H              1382    0.5
    4    2.5   W   315   Middleman, Scott M               1382    1.5
    5    2.5   L   174   Cypert III, Nathan V             2021    3.5
    6    2.5   L   103   Hanken, Jerome B                 2200    3.5
    7    3.5   W   312   Worcester, James                 1495    2.5
    8    4.0   H     -   Bye
    9    4.0   L   247   Ambrioso, Alexander A            1622    5.0
   10    5.0   W   353   Lauger, Stephen                  1567    4.0
   11    6.0   W   251   Kiel Sr, Gary W                  1630    5.0
   12    6.0   L   104   Wong, Sheldon                    2210    7.0

Final rating: 1765  (-110)      Average Opp Rating: 1674

So, it seems that Rubenstein took a TR bye on Monday in order to participate in the D5. Which makes sense. Perhaps he was considering dropping the TR section if he had scored better in the D5. But, given a 1/2-point bye in R8, his score was better in the TR section, and so he kept that result.

So now, working the others in similar fashion, we know all the players, their sections, and their drop-outs.

Time to declare victory and move on… perhaps to US Open (1996)?

z

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