MESON Chess Problem Database

Problem Display
PID: 259481 (3NR3/5p2/2N2p2/n2kbQ2/1Br3pK/1B4p1/bq1n4/3R4 w - - 0 1)

Cheylan, Yves

6th Comm., Problemas, 1974

3NR3/5p2/2N2p2/n2kbQ2/1Br3pK/1B4p1/bq1n4/3R4

#2

8 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Rxd2#
    • 1...Qd4
      • 2.Se7#
  • Tries
    • 1.Rxd2+?
      • 1...Qd4
        • 2.Se7#
        • 2.Rxd4#
      • 1...Qxd2!
    • 1.Rxe5+?
      • 1...Qxe5
        • 2.Rxd2#
      • 1...fxe5!
    • 1.Qd3+?
      • 1...Qd4
        • 2.Se7#
      • 1...Bd4!
    • 1.Qd7+?
      • 1...Bd6
        • 2.Qxd6#
        • 2.Qxf7#
      • 1...Ke4!
    • 1.Qf4?
      • threat
        • 2.Se7#
      • 1...Sxc6
        • 2.Qxc4#
      • 1...Bd6
        • 2.Qxd6#
        • 2.Qe4#
      • 1...Bxf4!
  • Keys
    • 1.Qxg4!
      • threat
        • 2.Se7#
      • 1...Sxc6
        • 2.Qxc4#
      • 1...Bc3
        • 2.Qe4#
      • 1...Bd4
        • 2.Qd7#
      • 1...Bf4
        • 2.Qf3#
      • 1...Bd6
        • 2.Qe4#
      • 1...Bc7
        • 2.Qe4#
      • 1...Bb8
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • Q(b);N_GUARD::R(A),XS(c)
    • Q(b);N_SPINS(c),SBLOCK::S(F)
  • Tries
    • Try
      • R(A);CHECK,XS(c)
      • Refutation
        • Q(b);XR(A)
    • Try
      • R(H);CHECK,XB(i)
      • Vars
        • Q(b);P_SPINQ(b),XR(H)::R(A),XS(c)
      • Refutation
        • P(j);P_SPINP(j),XR(H)
    • Try
      • Q(E);CHECK,N_PINB(i),N_PINS(c)
      • Vars
        • Q(b);P_SPINQ(b)::S(F)
      • Refutation
        • B(i);P_SPINB(i)
    • Try
      • Q(E);CHECK,N_PINB(i)
      • Refutation
        • K(h);N_SPINR(e),N_SPINS(c),P_SPINB(i),S_FLIGHT
    • Try
      • Q(E);N_PINB(i)
      • Threat
        • S(F)
      • Vars
        • S(g);N_GUARD,XS(F)::QAB1(E),XR(e)
      • Refutation
        • B(i);XQ(E)
  • Actual
    • Q(E);N_PINB(i),P_SPINQ(E),XP(f)
    • Threat
      • S(F)
    • Vars
      • S(g);N_GUARD,XS(F)::QAB1(E),XR(e)
      • B(i);::QAB1(E)
      • B(i);N_PINQ(E),N_SPINS(c)::QAR2(E)
      • B(i);N_PINQ(E)::QAB(E)
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