MESON Chess Problem Database

Problem Display
PID: 173252 (1Nk3nq/P4P2/KB4bp/1p3R2/6R1/p6B/2NP1r1b/2Q1r3 w - - 0 1)

Mari, Alberto

Stratford Express, 1951

1Nk3nq/P4P2/KB4bp/1p3R2/6R1/p6B/2NP1r1b/2Q1r3

#2

11 + 10

56 The Problemist 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Rc5#
    • 1...Bg1
      • 2.Rc5#
  • Tries
    • 1.Sxe1+?
      • 1...Bc7
        • 2.Qxc7#
      • 1...Qc3!
    • 1.Sd4+?
      • 1...Bc7
        • 2.Qxc7#
      • 1...Rxc1!
    • 1.Rc4+?
      • 1...bxc4
        • 2.Rc5#
      • 1...Bc7!
    • 1.Rd4?
      • threat
        • 2.Rd8#
        • 2.Rc5#
      • 1...Qxd4
        • 2.Rc5#
      • 1...Rxd2
        • 2.Rc5#
      • 1...Rxf5
        • 2.Rd8#
      • 1...Bxf5
        • 2.Rd8#
      • 1...Qe5
        • 2.Rd8#
      • 1...Qf6
        • 2.Rc5#
      • 1...Re5
        • 2.Rd8#
      • 1...Re6
        • 2.Rd8#
      • 1...Re8
        • 2.Rc5#
      • 1...Be5
        • 2.Rd8#
      • 1...Bd6
        • 2.Rc5#
      • 1...Sf6
        • 2.Rc5#
      • 1...Se7
        • 2.Rc5#
      • 1...Bc7!
  • Keys
    • 1.Re5!
      • threat
        • 2.Rc4#
      • 1...Re4
        • 2.Sd4#
      • 1...Rf4
        • 2.Rc5#
      • 1...Rf5
        • 2.Sxe1#
      • 1...Bf4
        • 2.Rxg6#
      • 1...Be4
        • 2.Rxg8#
        • 2.Re8#
      • 1...Bf5
        • 2.f8Q#
        • 2.f8R#

There are these versions: 173253, 183757

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(b);S_CUTB(c)::R(F)
    • B(c);N_GUARD::R(F)
  • Tries
    • Try
      • S(B);CHECK,XR(a)
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR1(A),XB(c)
      • Refutation
        • Q(j);P_SPINQ(j)
    • Try
      • S(B);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR1(A),XB(c)
      • Refutation
        • R(a);XQ(A)
    • Try
      • R(E);CHECK
      • Vars
        • P(e);XR(E)::B(D)+R(F),DCHECK
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • R(E);
      • Threat
        • DUALS(2)
      • Vars
        • Q(j);XR(E)::B(D)+R(F),DCHECK
        • R(b);XP(C)::B(D)+R(F),DCHECK
        • R(b);P_SPINR(b),XR(F)::R1(E)
        • B(f);P_SPINB(f),XR(F)::R1(E)
        • Q(j);::R1(E)
        • Q(j);P_PINB(H)::B(D)+R(F),DCHECK
        • R(a);::R1(E)
        • R(a);P_PINB(H)::R1(E)
        • R(a);::B(D)+R(F),DCHECK
        • B(c);::R1(E)
        • B(c);::B(D)+R(F),DCHECK
        • S(i);::B(D)+R(F),DCHECK
      • Refutation
        • B(c);
  • Actual
    • R(F);
    • Threat
      • B(D)+R(E),DCHECK
    • Vars
      • R(a);N_GUARD,S_CUTB(f)::QAR(A)+S(B)
      • R(b);S_CUTB(c)::R(F)
      • R(b);S_CUTB(f)::QAR(A)+S(B),XR(a)
      • B(c);S_CUTR(b)::B(D)+R(E),XB(f)
      • B(f);N_GUARD,S_CUTR(b)::P=Q
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