py_20221129

{

} 1.Rh4-h1 + ! {

} 1...f2-f1=Q 2.Rh1*f1[+bQd8] + 2...Qd8*f6[+wBc1] # {

} 1...f2-f1=R 2.Qb4-e1 + 2...Rf1*f3[+wSb1] # {

} 1...f2-f1=B 2.Bc2-d3 2...Bf1*d3[+wBf1] # {(3 Bxd3 impossible because the Bishop rebirth on c8}

} 1...f2-f1=S 2.Sc4-e3 2...Sf1*e3[+wSg1] # {

AUW}

{

Tries :
} 1.Rb3-e3 ? {(threatens} 2.WCd2*g3 # {by controlling e5)
Mais} 1...BCc7-d4 ! {as 2 Bxd4# is no more possible
} 1.Bg1-e3 ? {(threatens} 2.Be3-g5 # {)
Mais} 1...Se1-f3 ! {because 2 Rxf3# is no more possible

} 1.Rb3-a3 ! {
} 1...a7-a6 {(threat-variation)} 2.Ra3*a5 b7-b5 3.Sb8-d7 # {
} 1...Zh4*e6 {(for} 2.Ra3*a5 Ze6-b4 ! {)} 2.Ra3-e3 {(threatens} 3.Re3*e6 # {)
And now Ze6 plays, forr instance on b4} 2...Ze6-b4 3.WCd2*g3 # {
} 1...Zh4-e2 2.Bg1-e3 {(threatens} 3.Rg7-f7 # {)} 2...Ze2-h4 {(or Ze2-c5)} 3.Be3-g5 # {
} 1...Se1-d3 2.Ra3*d3 {(for} 3.Rd3-f3 # {)} 2...Za5*d3 3.Sb8-d7 # {

A noter que} 1.Rb3-b5 ? {with same threats :} 2.Rb5*a5 {followed by} 3.Sb8-d7 # {
works less well than the key because of } 1...Se1-d3 ! {

The threats of the trials are found as mates in the real play (Dombrovskis effect).}

{

} 1.nPd2-d1=nQ {
} 2.nQd1-h5 {"One of the most surprising moves I've seen" (K. Widlert).
Indeed, it is the only move which allows Ka1 and the continuation, i.e. the return of the neutral Queen on tiptoe
} 3.Kb2-a1 {
} 4.nQh5-e2 {
} 5.nQe2-c2 {
} 6.nQc2-b3 EQc3-e3 {stalemate !!

The neutral Queen cannot play on b4, c4, c2 and no pawn can play under threat of self check.}

{

} 1.d2-d1=R Qd3-b1 2.Rd1*b1-a8 Kg1-h1 #! {
Now 3.b1R does not paralyze Nb3 anymore, because after 3...Nxa5 the Rooks are not in real observation :
neither ...Rxb7 (no rebirth on a8) nor Rxb1 (no rebirth on h1) are possible.

} 1.b2-b1=B Qd3-c2 2.Bb1*c2-c8 Kg1-f1 # ! {
Now 3.d1B does not paralyze Nb3 anymore, because after 3...Nxa5 the Bishops are not in real observation :
neither ...Bxa4 (no rebirth on c8) nor Bxd1 (no rebirth on f1) are possible.
Note that it would be enough for White to play a waiting move on his 1st move so that after 2...Bxd3 or Rxd3, Nb3 is released.
But they don't: 1...fxe3 (Pe2) would put Queens in observation, 1...gxf3 is illegal (impossible rebirth on f2),
1...Rb8 woukd allow 2.cxb3(Pb7).}