MESON Chess Problem Database

Problem Display
PID: 275268 (5R2/8/1B6/3KN3/4p3/7B/2Qbkp2/4r2n w - - 0 1)

Eaton, Vincent Lanius

The Problemist, 1934

5R2/8/1B6/3KN3/4p3/7B/2Qbkp2/4r2n

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sg3
      • 2.Rxf2#
    • 1...f1S
      • 2.Bg4#
    • 1...f1B
      • 2.Bg4#
  • Tries
    • 1.Rf4?
      • threat
        • 2.Rxe4#
      • 1...f1S
        • 2.Bg4#
      • 1...Sg3
        • 2.Rxf2#
      • 1...e3!
    • 1.Qxe4+?
      • 1...Be3
        • 2.Qd3#
      • 1...Kd1!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Qxd2#
      • 1...exf3
        • 2.Re8#
      • 1...f1S
        • 2.Sg1#
      • 1...Rd1
        • 2.Qc4#
      • 1...e3
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(b);N_GUARD::R1(F),XP(e)
    • P(e);::B(B)
  • Tries
    • Try
      • R(F);
      • Threat
        • R(F),XP(f)
      • Vars
        • P(e);::B(B)
        • S(b);N_GUARD::R1(F),XP(e)
      • Refutation
        • P(f);
    • Try
      • Q(A);CHECK,N_PINB(c),XP(f)
      • Vars
        • B(c);P_SPINB(c)::QAB1(A)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • S(D);
    • Threat
      • QAR1(A),XB(c)
    • Vars
      • P(f);OGATEB,SBLOCK,XS(D)::R(F)
      • P(e);N_GUARD,S_CUTR(a)::S(D)
      • R(a);SBLOCK::QAB(A)
      • P(f);SBLOCK::S(D)
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