MESON Chess Problem Database

Problem Display
PID: 221422 (Q7/2Pr1R1K/5b2/R1q2kp1/2N3p1/8/2n1N1n1/1B6 w - - 0 1)

Shanshin, Valery Yurevich

SuperProblem 158. TT, 2015

Q7/2Pr1R1K/5b2/R1q2kp1/2N3p1/8/2n1N1n1/1B6

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Rxe5#
  • Tries
    • 1.Bxc2+?
      • 1...Rd3
        • 2.c8Q#
        • 2.c8B#
      • 1...Ke6!
    • 1.Rxc5+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...Ke6!
    • 1.c8B?
      • threat
        • 2.Bxd7#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Sf4
        • 2.Sd4#
      • 1...Ke6!
  • Keys
    • 1.c8Q!
      • threat
        • 2.Qxd7#
      • 1...Ke6
        • 2.Qxd7#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Sf4
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(d);OGATE::R1(D),XQ(d)
  • Tries
    • Try
      • B(A);CHECK,XS(a)
      • Vars
        • R(h);N_PINR(F),P_SPINR(h)::P=Q
      • Refutation
        • K(e);N_SPINB(g),N_SPINQ(d),S_FLIGHT
    • Try
      • R(D);CHECK,XQ(d)
      • Vars
        • R(h);N_GUARD,N_PINR(F),P_SPINR(h)::QAR2(H),XR(h)
      • Refutation
        • K(e);N_SPINB(g),N_SPINS(a),S_FLIGHT
    • Try
      • P(E);P_PINR(h)
      • Threat
        • B(E),XR(h)
      • Vars
        • Q(d);N_GUARD::QAR2(H),XQ(d)
        • S(b);SBLOCK::S(B)
      • Refutation
        • K(e);N_SPINB(g),N_SPINQ(d),N_SPINS(a),S_FLIGHT
  • Actual
    • P(E);P_PINR(h)
    • Threat
      • QAB(E),XR(h)
    • Vars
      • K(e);N_SPINB(g),N_SPINQ(d),N_SPINS(a),S_FLIGHT::QAB1(E),XR(h)
      • Q(d);N_GUARD::QAR2(H),XQ(d)
      • S(b);SBLOCK::S(B)
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