MESON Chess Problem Database

Problem Display
PID: 84181 (4R1bb/2p1Qp2/2PN1p1R/1P1k1pP1/1P4p1/K3prr1/4N2B/7B w - - 0 1)

Cheylan, Yves

The Problemist, 1974

4R1bb/2p1Qp2/2PN1p1R/1P1k1pP1/1P4p1/K3prr1/4N2B/7B

#2

12 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sc4?
      • threat
        • 2.Sxe3#
        • 2.Qc5#
      • 1...Rg2
        • 2.Qc5#
      • 1...f4
        • 2.Qc5#
        • 2.Qe4#
      • 1...Kxc4!
    • 1.Sxf5?
      • threat
        • 2.Sxe3#
        • 2.Qc5#
        • 2.Qe4#
      • 1...Rg2
        • 2.Qc5#
        • 2.Qe4#
      • 1...Kc4!
    • 1.Sxf7?
      • threat
        • 2.Qc5#
        • 2.Qe6#
      • 1...Bxf7
        • 2.Qc5#
      • 1...Kc4!
    • 1.Qe4+?
      • 1...Kxd6
        • 2.Rd8#
        • 2.Qd3#
        • 2.Qd4#
        • 2.Qe5#
      • 1...fxe4!
    • 1.Qxf7+?
      • 1...Kxd6
        • 2.Qd7#
      • 1...Bxf7!
  • Keys
    • 1.Qxe3!
      • threat
        • 2.Qd3#
      • 1...Kxd6
        • 2.Rd8#
      • 1...fxg5
        • 2.Qb3#
      • 1...Rg2
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(I);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);N_SPINR(b)::QAR1(K)
      • Refutation
        • K(e);N_SPINR(b),S_FLIGHT,XS(I)
    • Try
      • S(I);XP(f)
      • Threat
        • DUALS(3)
      • Refutation
        • K(e);N_SPINR(b),S_FLIGHT
    • Try
      • S(I);XP(i)
      • Threat
        • DUALS(2)
      • Vars
        • B(j);XS(I)::QAR1(K)
      • Refutation
        • K(e);N_SPINR(b),S_FLIGHT
    • Try
      • Q(K);CHECK,N_PINR(b)
      • Refutation
        • P(f);XQ(K)
    • Try
      • Q(K);CHECK,XP(i)
      • Vars
        • K(e);N_SPINR(b),OGATEB,P-FLIGHT,P_SPINP(g),P_SPINR(c),XS(I)::QAR1(K)
      • Refutation
        • B(j);XQ(K)
  • Actual
    • Q(K);P_SPINQ(K),XP(a)
    • Threat
      • QAR2(K)
    • Vars
      • K(e);N_SPINR(b),OGATEB,P-FLIGHT,P_SPINP(g),P_SPINR(c),XS(I)::R(L)
      • P(g);XP(G)::QAB(K)
      • R(c);N_SPINR(b)::S(B)
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