py_20111025

s#2 Patrol

: to capture, unit must be observed by friendly unit on the starting square of the move

Raffi RUPPIN
The Problemist, 2006

white Bb2 Ke4 Qc5 Pd6d5f6 Se6g7 Ra2 black Pb4b3 Ke5 Rc3 Sg2

s#2 Patrol(9+5)

{

} 1.Qc5-g1 ! {
} 1...Sg2-e1 2.Qg1-g2 + 2...Se1-f3 #{
} 1...Sg2-h4 2.Qg1-g2 + 2...Sh4-f3 #{
} 1...Sg2-f4 2.Qg1-g6 + 2...Sf4*g6 #{
} 1...Sg2-e3 2.Qg1-g4 + 2...Se3*g4 #{
} 1...b3*a2 2.Qg1-e3 + 2...Rc3*e3 #

serial h#12 Circe with neutral pieces

: Black plays n moves in a row helping White to (stale)mate him in one
: captured unit is reborn on its original square if free
: can be played by a side or the other

Chris FEATHER
The Problemist, 2012
3° Prix

neutral Pe2e3h7 black Pb7a2 Ka1 white Ke1 Rb6

ser-h#12 Circé(2+3+3)
e2, e3, h7: Neutral Pawns

Solution

{
Apparent Play
} 1...nPh7-h8=nB #{

Real Play
} 1.nPh7-h5 2.nPh5-h4 {
} 3.nPh4-h3 4.nPh3-h2 {
} 5.nPh2-h1=nB 6.nBh1-c6 {
} 7.b7*c6[+nBf1] 8.nPe2*f1=nS {
} 9.nSf1*e3[+nPe2] 10.nSe3-d1 {
} 11.nPe2*d1=nS[+nSb1] 12.a2*b1=R Rb6-a6 #

#2

: opposite units of same kind mutually controlling are paralyzed
: it is illegal to have mutual control of opposite units of same kind
: prolongated Knight in successive jumps

Gerard SMITS,
Ruud R.A. BEUGELSDIJK
Proleemblas, 2008 - 1° Prix

white Bh3h2 Kd1 WNh1 Pe2 Sf4 Rg2 black Bb7 Ke4 BNa5 Qh8 Pd2e3d4d5e5f6 Rd8

#2(7+11)
a) Madrasi
b) Isardam
🨢h1, 🨨a5: Nightriders

Solution

{

} a) {Madrasi
} 1.Sf4-e6 ? but 1...d4-d3 !{
} 1.Bh3-f5 + ? but 1...Bb7-c8 !{
} 1.WNh1-g3 + ? but 1...BNa5-e7 !{
} 1.WNh1-f2 + ? but 1...e3*f2 !{

} 1.Sf4-d3 ! threat: 2.Sd3-c5 #{
} 1...BNa5-b3 2.WNh1-g3 #{
} 1...Rd8-c8 2.Bh3-f5 #{
} 1...Qh8-f8 2.Rg2-g4 #{

} b) {Isardam
} 1.Sf4-e6 ? but 1...Bb7-c8 !{
} 1.Bh3-f5 + ? but 1...BNa5-e7 !{
} 1.WNh1-g3 + ? but 1...Rd8-g8 !{
} 1.WNh1-f2 + ? but 1...e3*f2 !{

} 1.Sf4-d3 ! threat: 2.Sd3-c5 #{
} 1...BNa5-b3 2.Bh3-f5 #{
} 1...Rd8-c8 2.Rg2-g4 #{
} 1...Qh8-f8 2.WNh1-g3 #

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