Eras and 30-year Grids

7/21/2025 UPDATE: FINALLY, … THE ERA 5 GRIDS (5-1, 5-2, 5-3) FOR THE FIRST RUN-THROUGH OF THE RetroPlay PROJECT HAVE BEEN UPDATED WITH IMPROVEMENTS. JUMP TO THEM HERE, BUT WE ALSO HAVE ON THIS PAGE THE COMPLETE 21ST CENTURY GRID (2001-2024; ONE-PIECE/SINGLE FILE). IT WAS NECESSARY TO BACKFILL WITH ACCURATE W.A.R. NUMBERS IN ORDER TO FACILITATE BOTH THE “EXTRA INNINGS” COMPONENT (2021-2024/25 SEASONS) OF RETROPLAY 1.0 AND… THE ENTIRE SCOPE OF RETROPLAY 2.0 (1901-2024/25), USING THE NEW REGIONAL TEAM COMBINATIONS. BUT NOW WE’RE AT THE POINT WHERE ANYONE WHO’S INTERESTED IN “REPLAYING” ALL MLB SEASONS FROM 1871 THROUGH 2024 WITH THE RetroPlay SYSTEM CAN DO SO, USING THE 1.0 GRIDS (AND CULLING TEMPLATES FROM THEM TO PRODUCE THE TEAM-BY-TEAM W.A.R. AND POSITION WORKSHEETS LIKE I’VE USED; SAMPLES HERE).

MEANWHILE, BACK IN THE SWEAT SHOP: NEXT, I PLAN TO ASSEMBLE AND CARRY FORWARD FAIR-AS-POSSIBLE REGIONAL FRANCHISES UNDER VERSION 2.0, FROM 1901 THROUGH 2024 (ACCOMPLISHED THROUGH THE 1970 SEASON AS OF 7/21/25, SO 50+ SEASONS TO GO!). BEYOND THAT, THERE’S THE NEW SERIES OF REPLAYS (TEMPLATE-WORKSHEET-CALCULATION-RESULTS PROCESS) FOR EACH TEAM IN THE OPEN BASEBALL LEAGUE/OBL INVOLVED IN 124-125 SEASONS (1901-2024/25).

THE PLANNED FINAL STAGES WILL BRING TOGETHER ALL OF THE RESULTS, COMPARISONS, AND ANALYSIS FOR VERSIONS 1.0 AND 2.0, AND HOPEFULLY, SOME PUBLICATIONS (IN ADDITION TO THE FULL RANGE OF WEBSITE POSTINGS). SO WE’LL SEE YOU LATE IN ’25 (OPTIMISTIC) OR ’26 (MORE REALISTIC) WITH THE MEGA-SUMMARY. (REMEMBER, ONCE AGAIN: YOU’RE ENCOURAGED TO USE ANY/ALL OF MY FRAMEWORK AND/OR REPLAY SUGGESTIONS TO CONDUCT YOUR OWN EXPERIMENTS WITH “REPLAYED” BASEBALL HISTORY; YOU DON’T HAVE TO WAIT FOR ME!).

~~~~~~~~~~~~~~~~~~~~~~///////~~~~~~~~~~~~~~~~~~~~~

3/22/2024: FINALIZED ERA 4 FILES (30-YEAR SPREADSHEET GRIDS COVERING 1961 THROUGH 1990) ARE NOW AVAILABLE ON THIS VERY PAGE. CHECK ‘EM OUT, PERUSE THE VOLUMINOUS DATA, AND MAKE THE HISTORICAL CONNECTIONS IN YOUR HEAD AS YOU WISH. THESE .XLS AND PDF FILES (VIEWABLE ONLINE IN PDF, WITH BOTH TYPES DOWNLOAD-READY) ARE THE REAL NUTS-AND-BOLTS OF THIS WHOLE HISTORICAL “REPLAY” PROJECT. GET THE MOST OUT OF THEM THAT YOU CAN, WHILE “WE” FORGE AHEAD WITH THE ERA 5 SEASONS, FROM 1991 THROUGH 2020 (AND BEYOND? WE’LL SEE).

~~~~~~~~~~~~~~~~~~~~~~~~~~~////~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

5/11/2023: UPLOADED ALL OF THE RECENTLY FINALIZED O.B.L. DATA FROM ERAS 1 THROUGH 3 (1871 THROUGH 1960). AFTER COPYING THIS ENTIRE PAGE TO ITS COUNTERPART ON BASEBALL150.COM (ALSO MY SITE), THE “REPLAYS” OF ERA 4 (1961-1990) WILL RESUME IN EARNEST. WILL BE BACK AFTER WE’VE GOTTEN THROUGH THE 1970 SEASON (HOPEFULLY).

5/3/2023: HAVING COMPILED A SERIES OF MACRO-FILES THAT WERE MADE POSSIBLE BY THE PUSH TO FINISH O.B.L. “REPLAYS” THROUGH 1960 (END OF OUR PROJECT’S THIRD ERA OF THE 5 PROJECTED, RUNNING THROUGH 2020), THOSE MACROS ARE NOW BEING POSTED. YOU CAN JUMP TO THE SECTION OF THIS PAGE WHERE THE LATEST FILES HAVE BEEN UPLOADED BY CLICKING HERE. (THE OLDER TEXT HERE IS SUBJECT TO REVISION, BUT THE CURRENT PRIORITY IS TO PUBLISH THE UPDATED GENERAL SUMMARY (“MACRO” ) FILES, AND THAT WILL CONCLUDE TODAY’S BUSINESS ON THIS PAGE).

~~~~~~~~~~~~~~~~~~~~~~~~///////~~~~~~~~~~~~~~~~~~~~~~~~~~

It seems that at least a majority of baseball historians and compilers of official/quasi-official publications consider the years 1871 through 2020 as the “First 150” of “major-league” baseball. Some will contend for 1876 as the real start of Major League Baseball (usually abbreviated as “MLB” hereafter, and site-wide), since that year marked the founding of the National League, the only league in existence for all 145 years of that span (1876 through 2020). By that reckoning, the National Association that ran from 1871 through 1875 is dismissed as illegitimate for its lack of: a) true, top-flight professional ballplayers; b) franchise and scheduling integrity; and/or c) league organization on the whole, from drawing-board to on-the-fly execution; all in all, a slip-shod operation at worst, and only a precursor to real MLB at best. [Side note: the one-season-and-done Union Association of 1884 is another controversial league that is not always accorded genuine historical MLB status, and, depending on the day and the writer/speaker, I’ve found that I can land on either side of that issue].

But since I prefer maximum symmetry, consistency, and simplicity, we’re going with the following:

1) All 150 years, from 1871 through 2020 (the project’s end-year);

2) The National Association and the Union Association records are included in the project’s scope;

3) Organized “Negro League Baseball” (NLB) player records are incorporated wherever feasible;

4) FIVE Eras of 30 years (seasons) each; just the right amount to fit a landscape-oriented printable page;

5) BIRTHPLACE is the sole-determiner for each player’s team assignment (by design from the start);

6) Actual, historical MLB/NLB W.A.R. (“Wins Above Replacement” or most often simply, WAR) values — supplied by Baseball-Reference.com (and in some NLB cases, Seamheads.com) and fixed in place for RetroPlay purposes before any updates made by source sites in 2022 — form the sole statistical basis for determining team WAR and (virtual) champions in each seasonal “replay” (simulated season). Note, however, that positional integrity must be observed (all 9 positions individually covered over the course of a full season’s scheduled games);

7) WAR and average WAR per 162 games (baseline for full-season computation) are multiplied by each other and rounded down to the nearest whole number to determine the RetroPlay Rating (RPR) for “career impact”; this figure can be a negative integer, but is almost always 0 or positive, and is the most-used criterion to rank players within groups and lists. “We” believe RPR is exclusive to RetroPlay.net — I haven’t seen it anywhere else! — and is a straightforward, commonsense ranking stat that rewards both exceptionally-high career WAR numbers (accumulation via longevity/durability) AND exceptionally-high full-season production, year in and year out (consistent seasonal dominance relative to peers); “we” like this measurement and think it’s valid, but there is also the recognition on “our” part that the professional number-crunchers can probably poke holes in the methodology or quibble with what the number (RPR) actually indicates; nonetheless, “we” forge on …

~~~~~~~~~~~~~~~~~~~~~~~~~~///////~~~~~~~~~~~~~~~~~~~~~~~~~~

THIS SECTION: THE UPDATED GRIDS FROM ERAS 1 THROUGH 3 (1871-1960)

THE RETROPLAY.NET ERAS — HERE’S WHERE THE “GRIDS” LIVE

Era 1 = 1871 through 1900 (entire 19th Century period of “MLB” play); this era is specifically covered on this RetroPlay.net page: (Early Baseball — 19th Century); however, here are copies of Grid number one (O[BL]1, 50 pgs.) in Excel-compatible spreadsheet form (top), and PDF (bottom). All ten (10) Grids WILL EVENTUALLY be here in one place, if things go according to plan:

Era 2 = 1901 through 1930 (first 30 years of “modern day major-league baseball”; NLB founding years). For the data on/coming out of this foundational period, see the Excel-compatible spreadsheets (grids) O[BL] 2-1 and 2-2, the two grids/spreadsheets that cover all participants in Era 2. Download links are immediately below, with Excel-type on top, PDF below that:

Era 3 = 1931 through 1960 (next 30-year period of established stability, previous to MLB expansion in 1961-62); data spreadsheets/grids from this era (O[BL]3-1 and 3-2 ) can be downloaded here (Excel-compatible versions top, PDF versions below those):

IMPORTANT TO NOTE: THE GRIDS FROM ERA 5 (1991-2020) SHOULD BE CONSIDERED TO BE ONLY ROUGH DRAFTS AT THIS STAGE. AS I “REPLAY” THE SEASONS WITH BIRTHPLACE-BASED TEAMS, I FIND THAT “TWEAKS” IN THE SEASON’S RULES AND PLAYER-TERRITORIES ARE SOMETIMES NECESSARY IN ORDER TO BETTER MAINTAIN BALANCE IN PLAYER DISRIBUTIONS (WOULD RATHER NOT LEAVE SOME REGIONAL TEAM HIGH AND DRY/NON-COMPETITIVE ANY MORE THAN NECESSARY, SO SOME RE-COMBINATIONS MIGHT BE IN ORDER). TRANSLATION: UNTIL I ACTUALLY DO THE SEASONAL REPLAYS, I MIGHT NOT FORESEE WHERE PLAYER POPULATIONS ARE INSUFFICIENT IN A GIVEN YEAR (MAKING PLAYER-LOANS NECESSARY/INABILITY TO FIELD A TEAM IN A PARTICULAR SEASON); IT MAKES SENSE TO WAIT UNTIL RESULTS CAN BE FIRMED UP BEFORE CALLING ANYTHING “FINAL.”

~~~~~~~~~~~~~~~~~~~~~~~~~~///////~~~~~~~~~~~~~~~~~~~~~~~~~~

Era 4 = 1961 through 1990 (MLB, historically speaking: expansion of teams and rosters, advent of relief specialists; more “world-wide” make-up); data spreadsheets/grids from this era can be downloaded here (Excel-compatible versions top, PDF versions below those):

UPDATED ERA 5 GRIDS (POSTED 7/21/25)

Era 5 = 1991 through 2020 (last 30 years of 150; final MLB expansion, inter-league regular-season play; a truly “world-wide” game); Data spreadsheets/grids from this era (O[BL]5-1 [60 pgs.], 5-2 [55 pgs.], and 5-3 [33 pgs.]) can be downloaded here (Excel-compatible versions top, PDF versions below those):

21st CENTURY GRID (2001 through 2024)

Notes: Excel-compatible file top, PDF bottom. Single file, 135 pages. Subject to change as 2025 MLB results become available. View and/or download here:

[Notes: a) although the RetroPlay birthplace- and WAR-based season replay/simulation project ends with the 2020 season, players who appear to be on track to gain admission to the National Baseball Hall of Fame (the real one in Cooperstown) or merely to the RetroPlay RE-set [virtual] Hall of Fame (alternatively, the “20/20 Hindsight H.O.F.”) will be tracked — from time to time at the link above^ — beyond 2020; b) to anyone interested in the (virtual replay) team standings under the RetroPlay system in 2021(+): you should have most of the tools (supplied here, and by Baseball-Reference.com) to proceed with your own simulation(s) beyond the 2020 season (whether birthplace is used as your roster-determining basis or not, just add in new players and tabulate the team WAR values — again, keeping positional integrity in mind — (and roster limits, BTW) to arrive at the fresh results); c) in any case, have “mental fun” with this for years to come.]

TEMPLATE SAMPLES (SEASONAL, SORTED COLUMNS)

Helpful hints: By clearing the (unused/inapplicable) data in columns that flank the one you’re working with and printing only the concentrated area as a worksheet, you can create plenty of space for writing and save ink to boot. Template 2001 illustrates this best among these samples.

Okay, that should do it. Once you start perusing and working with these nuts-and-bolts files, I think you’ll appreciate how they’ve been constructed, and just how much info is packed into each page of each 30-year Grid. But there’s so much more to this overall RetroPlay baseball history and replay project; the whole story is told in component parts on the various pages of this site. Use the menu to explore what’s offered here; click on the links; get the free downloads; and take off in your own direction!

~~~~~~~~~~~~~~~~~~~~~~~~~~///////~~~~~~~~~~~~~~~~~~~~~~~~~~

This page last updated on July 21, 2025