MESON Chess Problem Database

Problem Display
PID: 101055 (b2n1N2/2rR3K/5NR1/4kp2/4Ppp1/8/4Q3/b5B1 w - - 0 1)

Letzen, Einar

Good Companions, 1922

b2n1N2/2rR3K/5NR1/4kp2/4Ppp1/8/4Q3/b5B1

#2

8 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Bd4#
    • 1...Rc6
      • 2.Rd5#
    • 1...Rxd7+
      • 2.S6xd7#
    • 1...Bd4
      • 2.Bxd4#
    • 1...Bd5
      • 2.exd5#
    • 1...Sc6
      • 2.Qb5#
  • Tries
    • 1.Rg5?
      • threat
        • 2.Sxg4#
        • 2.Rxf5#
      • 1...Kxf6
        • 2.Rxf5#
      • 1...Bxe4
        • 2.Sxg4#
      • 1...f3
        • 2.Rxf5#
      • 1...g3
        • 2.Sg4#
        • 2.Rxf5#
      • 1...Rxd7+!
    • 1.Qb5+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Rc5!
    • 1.Qb2+?
      • 1...Rc3
        • 2.Bd4#
      • 1...Bxb2!
    • 1.exf5+?
      • 1...Be4
        • 2.Qxe4#
      • 1...Kxf5!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Qd6#
      • 1...Rxd7+
        • 2.S8xd7#
      • 1...fxe4
        • 2.Rg5#
      • 1...Rc6
        • 2.Rd5#
      • 1...Bc6
        • 2.Qxa1#
      • 1...Sc6
        • 2.Qb5#
      • 1...Sb7
        • 2.Qe6#
      • 1...Sf7
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(f);N_PINR(F),S_CUTB(a)::B(A)
    • R(f);N_PINR(F)::R1(F)
    • R(f);CHECK,XR(F)::S(D),XR(f)
    • B(a);N_GUARD::B(A),XB(a)
    • B(g);OGATE::QAR(B)+P(C),XB(g)
    • S(h);S_CUTB(g),S_CUTR(f)::QAR(B)
  • Tries
    • Try
      • R(E);P_PINP(e)
      • Threat
        • DUALS(2)
      • Vars
        • K(d);N_SPINP(e),S_FLIGHT,XS(D)::R1(E),XP(e)
        • B(g);P_SPINB(g),XP(C)::S(D),XP(c)
        • P(b);::R1(E),XP(e)
      • Refutation
        • R(f);CHECK,XR(F)
    • Try
      • Q(B);CHECK
      • Vars
        • B(g);N_GUARD,P_SPINB(g)::QAR1(B),XB(g)
      • Refutation
        • R(f);N_PINR(F),P_SPINR(f)
    • Try
      • Q(B);CHECK
      • Vars
        • R(f);N_PINR(F),P_SPINR(f)::B(A)
      • Refutation
        • B(a);XQ(B)
    • Try
      • P(C);CHECK,XP(e)
      • Vars
        • B(g);N_GUARD,P_SPINB(g)::QAR1(B),XB(g)
      • Refutation
        • K(d);P-FLIGHT,XP(C)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • R(f);CHECK,XR(F)::S(H),XR(f)
      • P(e);OGATEB,XP(C)::R(E)
      • R(f);N_PINR(F)::R1(F)
      • B(g);S_CUTR(f)::QAB(B),XB(a)
      • S(h);S_CUTB(g),S_CUTR(f)::QAR(B)
      • S(h);N_GUARD::QAR1(B)
      • S(h);N_GUARD,N_PINR(F)::QAR1(B)
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Developed and maintained by Brian Stephenson.
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