Friday, September 11, 2020


 I'm halfway my session of 150 days in a row tactical training according my newly developed method which took me 20 years to devise. From the 75 days in a row that I have under my belt now, I spent 52 days with solving and memorizing 500 tactical puzzles. I spent the last 23 days with educating my system I (the unconscious brain).

What is happening?

  • I forget the move sequences of the solutions of the 500 tactical problems
  • I start to see the solutions instead.
  • When I think about a problem I am surprised that the clock ticks much slower (about a factor 5)
  • I have way more overview in my head
  • I feel that system I is working miracles the past 23 days

Of course these are just feelings, which are subjective by definition. But have a bit patience, after another 75 days, mr. Elo will be the judge. I'm optimistic.


  1. Your CT-Blitz rating tells us your progress in tactics

    1. That's the idea. Maybe I should say "Mr. Glicko will be the judge".

  2. Congratulations and best wishes for your continuing success!

    You should write a book about your training method. SERIOUSLY!

    (Not so seriously:) We can resurrect the Knights Errant of the Round (and Round We Go adult Improvement) Table.

    I (for one) would certainly volunteer for a controlled experiment (keeping records, etc.), although I think the results will not be as impressive for me. I've already been following at least a significant part of your method for some time - with tangible improvements. Like you, I can "feel" the improvement results, although I haven't been letting Mr. Glicko keep me honest about the quantity of improvement.

    Hope springs eternally!

    1. "We can resurrect the Knights Errant of the Round (and Round We Go adult Improvement) Table."

      Nah, we need a more catchy name. What about "the spiralling vultures" or "the roadkill scavengers"?

  3. You should write a book about your training method. SERIOUSLY!

    We will see about that. I first need the blessing of Mr. Glicko. He can tell us something about the transfer ratio. How will the skill learned in one problem transfer to another problem? That is impossible to predict.

    OTOH, this is the first time that I feel system I working miracles since about 2007, when I had my greatest progress in rating. I always have been looking for that same experience, but no training method could replicate that feeling. Until lately.

  4. PART I:

    Here’s an interesting example which I think is a good demonstration of how PoPLoAFun enables one to logically find a viable solution in a tactically complcated position.

    FEN: r7/pbq3bk/1n1NRr1B/2pPNp2/6pP/8/2RQ1PP1/6K1 w - - 1 0

    Vorobyets – Kogan, Lvov, 1974 (I can't find the game score.)
    Test Your Chess IQ – Master Challenge, Test 8, #57 by August Livshitz

    The “leitmotif” for this position is given by Master Livshitz as “diversion.”

    It certainly is "diverting" - of a coherent approach to solving.

    There are no "obvious" checks, captures or threats to trigger pattern recognition.

    Aox's suggested question is very useful for framing the direction to search:

    What is the problem/position about (checkmate - material gain - Pawn promotion)?

    The actual game continuation follows the second-best solution (per computer). As an experiment, I tried playing against both programs from the starting position, following the recommended line(s). In both cases, both programs deviated from the (supposedly strongest) defensive lines after a couple of moves. That strikes me as somewhat bizarre. Even more bizarre was Komodo's response of playing (essentially) "give-away" to stretch out the distance to checkmate.

    FWIW: Here are the findings of two silicon monsters (Stockfish and Komodo on Chess Tempo). I set each program to consider 17 alternatives, simply because that covered all possibilities with a positive outcome for White. That is an EXTREME case of overkill!

  5. PART II:

    Stockfish (after 1.5 days):

    D43 Mate 11 0.Qg5 Rxe6 1.Qxf5+ Kh8 2.dxe6 Bxh6 3.Qg6 Qg7 4.Nef7+ Kg8 5.Nxh6+ Kf8 6.e7+ Kxe7 7.Nhf5+ Kd7 8.Qxg7+ Ke6 9.Qe7+ Kd5 10.Qe4#

    D43 Mate 15 0.Rxc5 Qxc5 1.Qg5 Qc1+ 2.Qxc1 Nxd5 3.Qb1 Bc8 4.Bxg7 Bxe6 5.Bxf6 Nxf6 6.Qb7+ Nd7 7.Nxd7 Kg6 8.Qxa8 Bxd7 9.Qd8 g3 10.Qxd7 gxf2+ 11.Kxf2 Kf6 12.Ne8+ Ke5 13.Qd6+ Ke4 14.Nf6#

    D42 +16.78 0.Bxg7 Qxg7 1.Rxc5 Nxd5 2.Rxf6 Qxf6 3.Nxb7 Ne7 4.Nd7 Qg6 5.Qd4 Qe6 6.Nf6+ Kg6 7.h5+ Kg7 8.Ne8+ Kf8 9.Nc7 Qh6 10.Nxa8 Qxh5 11.Qf6+ Qf7 12.Qd6 Kg8 13.Rc7 g3 14.Rxe7 gxf2+ 15.Kxf2 Qa2+ 16.Kg1 Qa1+ 17.Kh2 Qh8+ 18.Kg3 Qc3+ 19.Kf2 Qb2+ 20.Re2 Qg7 21.Qd8+ Kh7 22.Re7 f4 23.Qc7 Kg6 24.Rxg7+ Kf5 25.Rf7+ Ke6 26.Qxf4

    D42 +16.37 0.Nef7 Rxe6 1.dxe6 Qc6 2.Nxb7 Bf6 3.Rxc5 Qa4 4.Nbd6 g3 5.Be3 Qa1+ 6.Rc1 Qb2 7.Qd1 Kg6 8.Qf3 Nc4 9.Qxf5+ Kg7 10.Nxc4 Qxf2+ 11.Bxf2 gxf2+ 12.Qxf2 Re8 13.Qg3+ Kf8 14.Qf3 Rxe6 15.Ng5 Re7 16.Qxf6+ Ke8 17.Ne5 Rb7 18.Qg6+ Ke7 19.Qf7+ Kd6 20.Qxb7

    D42 +11.09 0.Rxf6 Bxf6 1.Qf4 Bc8 2.Nxg4 Bg7 3.Bxg7 Qxg7 4.Ne8 Nxd5 5.Ngf6+ Nxf6 6.Nxg7 Kxg7 7.Re2 Ne4 8.Qe5+ Kf7 9.Qd5+ Be6 10.Qb7+ Kf6 11.Qxa8 Ke5 12.f3 Bd5 13.Qd8 Bc4 14.Re3 Be6 15.fxe4 fxe4 16.Rg3 c4 17.Rg5+ Bf5 18.Qe7+ Kf4 19.Qxa7 c3 20.Rxf5+ Kg4

    D42 +10.06 0.Ndf7 Rxf7 1.d6 Qc8 2.Nxf7 Qxe6 3.Ng5+ Kg6 4.Nxe6 Bxh6 5.Nf4+ Kh7 6.Rxc5 Rg8 7.Qa2 Bxf4 8.Qf7+ Rg7 9.Qxf5+ Kg8 10.Qe6+ Rf7 11.Qxg4+ Rg7 12.Qe6+ Rf7 13.Rh5 Bh2+ 14.Kf1 Bc6 15.Ke1 Bd7 16.Rg5+ Kf8 17.Qg6 Re7+ 18.Kd1

    D42 +8.64 0.Nxf5 Rxf5 1.d6 Rxe5 2.Rxe5 Qc6 3.Qd3+ Kg8 4.f4 Bxe5 5.Qg6+ Kh8 6.fxe5 Rg8 7.Qf6+ Kh7 8.Qf7+ Kxh6 9.Qxg8 Qe4 10.Qg5+ Kh7 11.Rf2 Qd4 12.Qf5+ Kg8 13.Kh2 Bf3 14.Qe6+ Kf8 15.Qf6+ Kg8 16.Kg3 Nd7 17.Qg5+ Kf7 18.Qe7+ Kg6 19.Qe6+ Kh5 20.gxf3 Qxf2+ 21.Kxf2 gxf3 22.Qxd7 c4 23.Kxf3 c3 24.Qg4+ Kh6

    D42 +7.14 0.Nb5 Qd8 1.Bxg7 Rxe6 2.dxe6 Qxd2 3.Rxd2 Nd5 4.Bf8 Re8 5.e7 Nxe7 6.Rd7 Bc8 7.Rxe7+ Rxe7 8.Bxe7 Ba6 9.Nd6 f4 10.Nxg4 f3 11.g3 c4 12.Ne5 c3 13.Nxf3 c2 14.Bg5 Kg7 15.Kg2 c1=Q 16.Bxc1 Kf6 17.Bg5+ Ke6

    D42 +6.36 0.Nxg4 fxg4 1.Bxg7 Qxg7 2.Nxb7 Rxe6 3.dxe6 Qd4 4.Nxc5 Qxd2 5.Rxd2 Kg6 6.Rd4 Kf5 7.g3 Ke5 8.Rxg4 Kd6 9.Na6 Re8 10.Kg2 Rxe6 11.Rg7 Rf6 12.Nc7 Ke5 13.Ne8 Rf8 14.Rg5+ Kd4 15.Nc7 Rxf2+ 16.Kxf2 Nc4 17.h5 Ke4 18.Rg4+ Kd3 19.Nd5 a5 20.h6 a4

    D42 +6.33 0.Nxb7 Bxh6 1.Qd3 c4 2.Rxf6 Qxe5 3.Qxf5+ Qxf5 4.Rxf5 Kg6 5.Nd6 Rd8 6.h5+ Kh7 7.Ne4 Rf8 8.Rf6 Bg7 9.Rc6 Nxd5 10.R2xc4 g3 11.fxg3 a5 12.Ng5+ Kh8 13.g4 Bb2 14.Ne6 Rb8 15.Rc8+ Rxc8 16.Rxc8+ Kh7 17.g5 Be5 18.Ra8 Nf6 19.Ra7+ Kh8

    D42 +4.82 0.Nd7 Qxd7 1.Bxg7 Qxg7 2.Nxb7 Rxe6 3.dxe6 Qd4 4.Nd6 Nd5 5.Qg5 g3 6.Qxf5+ Kh8 7.Qh5+ Kg8 8.Qg6+ Qg7 9.Qxg7+ Kxg7 10.Rxc5 Ne7 11.Rg5+ Kf6 12.Rxg3 Kxe6 13.Nb5 Kf7 14.Ra3 a5 15.Kh2 Ng6 16.g3 Nxh4 17.gxh4 Kg6 18.Kg3 Kh5 19.Nc7 Ra7 20.Ne6 a4 21.f4 Ra8 22.f5 Rg8+ 23.Ng5 Rf8 24.Kf4 Ra8 25.f6 Kxh4

    D42 +4.70 0.Bf4 Nxd5 1.Ne8 Rxe8 2.Rxe8 Rd6 3.Qd3 Nxf4 4.Qxf5+ Ng6 5.Qh5+ Bh6 6.Rd2 Kg7 7.Rxd6 Qxd6 8.Qxg4 Bd5 9.h5 Bf7 10.Nxf7 Kxf7 11.Ra8 Ne7 12.Rxa7 Bg7 13.Qc4+ Qe6 14.Qxc5 Bf6 15.g3 Kg7 16.Kh2 Qe4 17.Ra6 Qf3 18.Ra3 Qe4 19.Qe3 Qxe3 20.Rxe3 Nf5 21.Ra3 Nxg3 22.Rxg3+ Kf8 23.h6 Kf7 24.h7 Ba1

    D42 +0.40 0.Qd3 Ba6 1.Nec4 Bxc4 2.Nxc4 Kxh6 3.Ne3 Kh7 4.Rxf6 Bxf6 5.d6 Qc8 6.Nxf5 Kh8 7.Qe4 Qe8 8.Qxg4 c4 9.Re2 Qf7 10.Qf4 Nd7 11.Ne7 c3 12.g4 Qg7 13.g5 c2 14.Rxc2 Bxe7 15.Qe4 Re8 16.Rc7 Nf6 17.Qf3 Qg6 18.dxe7 Ng8 19.Qd5 Rxe7 20.Rc6 Qb1+ 21.Kh2 Qe1 22.Kg2 Qe4+ 23.Qxe4 Rxe4

    D42 +0.08 0.Qe3 Nxd5 1.Rxc5 Qxd6 2.Rxd6 Nxe3 3.Rxf6 Bxf6 4.Bxe3 Rc8 5.Rb5 Be4 6.Ra5 g3 7.fxg3 Bxe5 8.Rxe5 Rc2 9.Bf4 Rxg2+ 10.Kf1 Rh2 11.Re7+ Kg6 12.Rxa7 Bf3 13.Rd7 Re2 14.Rd2 Rxd2 15.Bxd2 Kh7 16.Kf2 Bd1 17.Ke3 Kh6 18.Bc1 Bg4 19.Kf4 Kg6 20.Ke5 Kg7 21.Be3 Kf7 22.h5 Bxh5

    D42 0.00 0.Be3 Rxe6 1.dxe6 Bxe5 2.Bxc5 Qc6 3.Nxb7 Qxb7 4.Bd6 Bxd6 5.Qxd6 Rc8 6.Rxc8 Qxc8 7.Qe7+ Kh8 8.Qf6+ Kg8 9.Qg6+ Kh8 10.g3 Qf8 11.Qh5+ Kg8 12.Qg5+ Kh8

    D42 0.00 0.Ne4 fxe4 1.Qg5 Rxe6 2.Qf5+ Kh8 3.Bxg7+ Qxg7 4.dxe6 Kg8 5.Rxc5 Rf8 6.Nf7 e3 7.fxe3 g3 8.Re5 Nd5 9.Qd3 Rc8 10.Qa3 Rc3 11.Qa1 Qf6 12.Rg5+ Kf8 13.Rxg3 Qxh4 14.Nd6 Qxg3 15.Qf1+ Nf6 16.e7+ Kg8 17.e8=R+ Nxe8 18.Qf7+ Kh8 19.Qh5+ Kg8 20.Qxe8+ Kh7 21.Qh5+ Kg8

    D42 0.00 0.Ne8 Rxe8 1.Rxe8 Bxh6 2.Qd3 Kg7 3.Qa3 Nxd5 4.Rxc5 Qb6 5.Rc4 Ba6 6.Rc5

  6. PART III:

    Komodo (after 1.1 days):

    D25 Mate 11 0.Qg5 Nc4 1.Rxc4 Rb8 2.Rxf6 Bxd5 3.Qxf5+ Kg8 4.Rxg4 Be4 5.Qxe4 Rb1+ 6.Qxb1 Qe7 7.Bxg7 Qxg7 8.Rxg7+ Kxg7 9.Qg6+ Kh8 10.Ndf7#

    D25 Mate 12 0.Rxc5 Qxc5 1.Re7 Rg8 2.Qg5 Qc1+ 3.Qxc1 Nxd5 4.Rxb7 Rxh6 5.Qg5 Nf4 6.Qxf5+ Rg6 7.Nxg6 Ne2+ 8.Kh2 g3+ 9.fxg3 Rd8 10.Ne7+ Kh8 11.Nf7#

    D25 +6.04 0.Nef7 Nxd5 1.Ng5+ Kg8 2.Nxb7 Rxe6 3.Nxe6 Qxb7 4.Bxg7 Re8 5.Qh6 Rxe6 6.Qxe6+ Kxg7 7.Rxc5 Ne7 8.Qe5+ Kf8 9.Rc7 Qb4 10.h5 f4 11.h6 Qb1+ 12.Kh2 g3+ 13.fxg3 fxg3+ 14.Qxg3 Qh7 15.Qd6 Qe4 16.Qf6+ Ke8 17.Rxa7 Qe3 18.Qh8+ Kf7

    D25 +5.44 0.Bxg7 Qxg7 1.Qg5 Rxe6 2.dxe6 Qxg5 3.hxg5 Bd5 4.e7 Bb3 5.Rxc5 Ba4 6.Nxf5 Be8 7.Ra5 Bh5 8.Nd6 g3 9.f4 Rb8 10.Nc6 Rg8 11.f5 Nc8 12.g6+ Bxg6 13.fxg6+ Kxg6 14.e8=Q+ Rxe8 15.Nxe8 Kf7 16.Nc7 Ne7 17.Nxe7 Kxe7 18.Rxa7 Kd6 19.Nb5+ Ke5 20.Rf7

    D25 +4.81 0.Nxf5 Bxh6 1.Qd3 Rxe6 2.Ne7+ Kg7 3.dxe6 Qxe7 4.Qg6+ Kf8 5.Qxh6+ Qg7 6.e7+ Kg8 7.Qe6+ Kh7 8.e8=Q Rxe8 9.Qxe8 Be4 10.Qh5+ Kg8 11.Rxc5 g3 12.fxg3 Bd5 13.g4 Be4 14.Qe8+ Kh7 15.g5 Bd5 16.g3 Be4 17.Qh5+ Kg8

    D25 +4.40 0.Rxf6 Bxf6 1.Qf4 Bxe5 2.Qxf5+ Kxh6 3.Qxe5 Nxd5 4.Qe6+ Kh7 5.Qf5+ Kh8 6.Rc4 Qxd6 7.Qh5+ Kg8 8.Rxg4+ Kf8 9.Qh8+ Ke7 10.Qg7+ Ke8 11.Qxb7 Nc7 12.Rg8+ Kd7 13.Rxa8 Qd1+ 14.Kh2 Qd4 15.Rxa7 Qxh4+ 16.Kg1 Qf4 17.Qb5+ Kd6 18.Qb6+ Kd7 19.Qxc5 Qd6 20.Qf5+ Kd8 21.g3 Qd1+ 22.Kh2 Qd6 23.Qg5+ Kd7 24.Qg4+ Kd8 25.Qg8+ Ke7 26.Qh7+ Kd8 27.Qh8+

    D25 +4.31 0.Nb5 Qd8 1.Qg5 Bxh6 2.Qxf6 Qxf6 3.Rxf6 Rf8 4.Rxf8 Bxf8 5.d6 Ba6 6.d7 Be7 7.Nxa7 Nxd7 8.Nxd7 Bd3 9.Rc3 c4 10.Nc6 Bxh4 11.Nce5 Be2 12.Re3 Bd3 13.Nxd3 Bg5 14.Re5 cxd3 15.Rxf5 Kh6 16.Rd5 d2 17.Ne5 Bf4 18.Nxg4+ Kg6 19.Ne3 Bxe3

    D25 +3.66 0.Nxb7 Rxe6 1.Bxg7 Rxe5 2.Qh6+ Kg8 3.Qh8+ Kf7 4.Bxe5 Rxh8 5.Bxc7 Nxd5 6.Bd8 f4 7.Rxc5 Ke6 8.Bg5 Rh7 9.Nd8+ Kd6 10.Rc6+ Ke5 11.Ra6 Rc7 12.Nc6+ Ke4 13.Ra4+ Kf5 14.Rd4 Rxc6 15.Rxd5+ Ke4 16.Ra5 f3 17.Rxa7 Rc2 18.Ra4+ Kf5 19.Ra5+ Kg6 20.Ra6+ Kg7 21.Be3 fxg2 22.Kxg2 Rc7

    D25 +2.88 0.Ndf7 Bxh6 1.Rxf6 Bxd2 2.d6 Nd7 3.dxc7 Nxf6 4.Rxd2 Re8 5.Nd6 Re7 6.Nxb7 Rxc7 7.Nd6 f4 8.Rd3 Re7 9.Ndc4 Rg7 10.Kf1 Re7 11.Ra3 g3 12.fxg3 fxg3 13.Rxg3 Nd7 14.Nf3 Nf6 15.Kg1 Kh6 16.Nfe5 Nd7 17.Rg5 Nxe5 18.Nxe5 Rc7 19.Ng4+

    D25 +2.71 0.Nxg4 fxg4 1.Bxg7 Qxg7 2.Nxb7 g3 3.fxg3 Rxe6 4.dxe6 Qd4+ 5.Qxd4 cxd4 6.Nd6 Nd5 7.Rd2 Ne7 8.Ne4 a5 9.Rxd4 Kg6 10.Ra4 Kf5 11.Ng5 Ke5 12.g4 Nd5 13.Re4+ Kd6 14.e7 Nxe7 15.Nf7+ Kd7 16.h5 Rf8 17.Rf4

    D25 +2.40 0.Bf4 Nxd5 1.Ne8 Rxe8 2.Rxe8 Rd6 3.Nc4 Qc6 4.Bxd6 Nf6 5.Ne3 Nxe8 6.Bxc5 Qe6 7.Qe2 a5 8.Qc4 Qxc4 9.Rxc4 Kg6 10.g3 Bf6 11.Ra4 Bd8 12.Nc4 f4 13.Nxa5 Bxa5 14.Rxa5 fxg3 15.fxg3 Bf3 16.Bd4 Nd6 17.Rg5+

    D25 +1.34 0.Nd7 Qxd7 1.Bxg7 Qxg7 2.Nxb7 Rxe6 3.dxe6 c4 4.Nd6 Qf6 5.Nxc4 Rd8 6.Qe2 Nxc4 7.Rxc4 Re8 8.Rc7+ Kg6 9.Rc6 a5 10.g3 a4 11.Qc4 Re7 12.Qxa4 Rxe6 13.Rc7 Re1+ 14.Kh2 Re7 15.Rc6 Re6 16.Rc8 Re1 17.Qd7 Re7 18.Qd5 Re6

    D25 +0.68 0.Qd3 Ba6 1.Ndc4 Bxc4 2.Nxc4 Kxh6 3.Ne3 Kh7 4.d6 Qd8 5.Rxf6 Qxf6 6.Rxc5 g3 7.fxg3 Nd7 8.Rxf5 Qd4 9.Rh5+ Kg8 10.Qb3+ Kf8 11.Qe6 Re8 12.Qxd7 Qxe3+ 13.Kh2 Qe6 14.Qc7 Bf6 15.Ra5 Rd8 16.Rxa7 Qd5 17.Qh7 Rxd6 18.Rc7 Rb6 19.Qh6+

    D25 +0.67 0.Ne4 fxe4 1.Qg5 Rxe6 2.Qf5+ Kh8 3.Bxg7+ Qxg7 4.dxe6 Kg8 5.e7 Qxe7 6.Rxc5 g3 7.Qg4+ Qg7 8.Qe6+ Kh7 9.fxg3 Bd5 10.Qd6 Rf8 11.Rc7 Bf7 12.Rxa7 Qxg3 13.Qf6 Qg7 14.Rxf7 Rxf7 15.Qxf7 Qxf7 16.Nxf7 Kg6 17.Nd6 Kh5 18.Nxe4 Kxh4 19.Kf2

    D25 +0.61 0.Be3 Rxe6 1.dxe6 Bxe5 2.Bxc5 Qc6 3.Nxb7 Qxb7 4.Bd6 Bxd6 5.Qxd6 Rc8 6.Rxc8 Qxc8 7.Qe7+ Kh8 8.Qf6+ Kg8 9.Qf7+ Kh8 10.Kh2 Nd5 11.Qxf5 Qc7+ 12.g3 Qd6 13.Qh5+ Kg7 14.Qf7+ Kh6 15.Qf5 Ne7 16.Qg5+ Kh7 17.Qh5+ Kg7 18.Qxg4+ Ng6

    D25 +0.45 0.Qe3 Nxd5 1.Rxc5 Qxd6 2.Rxd6 Nxe3 3.Rxf6 Bxf6 4.Bxe3 Rc8 5.Nd7 Rxc5 6.Nxf6+ Kg6 7.Bxc5 Kxf6 8.Bxa7 Kg6 9.g3 Ba6 10.Bd4 Bc4 11.Be5 Bd3 12.Bf4 Kh5 13.Be3 Kg6 14.Bg5 Ba6 15.Bf4

    D25 +0.15 0.Ne8 Rxe8 1.Rxe8 Bxh6 2.Qd3 Nxd5 3.Nxg4 Rf7 4.Nxh6 Kxh6 5.Rh8+ Kg7 6.Rh5 Qe5 7.Rg5+ Kh6 8.Rxc5 Qe1+ 9.Qf1 Qxf1+ 10.Kxf1 Nf4 11.f3 Bd5 12.g3 Nh3 13.Rxd5 Nxg5 14.Rd6+ Kh5 15.hxg5 Kxg5 16.Ra6 Rc7 17.Ke2 Rb7 18.Kf2 Rb2+ 19.Kf1 f4 20.Ra5+ Kf6 21.gxf4

  7. That's a freak problem! When almost every move wins, there must be a lot going on. That is the eternal problem with chess teachers. They want to show us the complex and the exceptional. But we must learn the simple and the common first.

  8. It's a simple example.. for thinking method.
    The black King is in serious danger so look for checkmate.
    If you can't find "anything" bring chess pieces closer, as stronger, as closer, as better.
    ( thanks to gm smirnov for this insight )

    Everyone has the new stockfish-version?

  9. I still use Stockfish version 9 on my laptop. I see that the latest version is Stockfish 12, with CCRL Rating: 3564 and CEGT Rating: 3512. My laptop is out of date (Windows 7), so I'll probably update Stockfish when I decide to update my laptop.

    I'm not sure which versions of Stockfish and Komodo are run on Chess Tempo. I expect that they use multiprocessor versions.

  10. As higher the rating as quicker the result of same qualitiy. Stockfish 12 should run on your windows 7 system too just muuuuch faster