MESON Chess Problem Database

Problem Display
PID: 160063 (3K4/8/1B3N2/8/3QP3/Rq3kP1/R2b1P2/1b3B2 w - - 0 1)

Larrain, Santiago

British Chess Magazine, 2002

3K4/8/1B3N2/8/3QP3/Rq3kP1/R2b1P2/1b3B2

#2

10 + 4

5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4
      • 2.Qxe4#
    • 1...Bc1
      • 2.Qd1#
    • 1...Be1
      • 2.Qd1#
    • 1...Bc3
      • 2.Qe3#
    • 1...Bb4
      • 2.Qd1#
    • 1...Bf4
      • 2.Qd1#
    • 1...Ba5
      • 2.Qd1#
    • 1...Bg5
      • 2.Qd1#
    • 1...Bh6
      • 2.Qd1#
  • Tries
    • 1.Bg2+?
      • 1...Ke2
        • 2.Qxd2#
      • 1...Kxg2!
    • 1.Rxb3+?
      • 1...Bc3
        • 2.Qe3#
        • 2.Qd1#
      • 1...Be3
        • 2.Rxe3#
        • 2.Qxe3#
        • 2.Qd1#
      • 1...Bd3!
    • 1.Qxd2?
      • threat
        • 2.Qf4#
        • 2.Qd1#
        • 2.Qe2#
      • 1...Bd3
        • 2.Qe3#
        • 2.Qf4#
      • 1...Qe3
        • 2.Rxe3#
        • 2.Qxe3#
        • 2.Qd1#
        • 2.Qe2#
      • 1...Bc2
        • 2.Qf4#
        • 2.Qe2#
      • 1...Qd3+!
    • 1.Qd7?
      • threat
        • 2.Qg4#
      • 1...Qe3
        • 2.Qf5#
      • 1...Qd3!
    • 1.e5?
      • threat
        • 2.Qg4#
      • 1...Qe3
        • 2.Qf4#
      • 1...Qd3
        • 2.Qd5#
      • 1...Be4
        • 2.Qxe4#
      • 1...Bf4
        • 2.Qd1#
        • 2.Qxf4#
      • 1...Bf5!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qh5#
      • 1...Qe3
        • 2.Qf5#
      • 1...Qd3
        • 2.e5#
      • 1...Bg5
        • 2.Qd1#

Anticipated by 177744(1985)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • B(a);OGATE,XP(G)::QAB1(F),XB(a)
    • B(b);OGATE::QAB(F)
    • B(b);N_GUARD,N_SPINQ(c),S_CUTQ(c)::QAR1(F)
    • B(b);OGATE,P_PINB(H)::QAB(F)
    • B(b);OGATE,P_PINS(I)::QAB(F)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(d);N_SPINQ(c),P_SPINB(b),S_FLIGHT::QAR1(F),XB(b)
      • Refutation
        • K(d);N_SPINQ(c),S_FLIGHT,XB(A)
    • Try
      • R(D);CHECK,XQ(c)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • Q(F);XB(b)
      • Threat
        • DUALS(3)
      • Refutation
        • Q(c);CHECK
    • Try
      • Q(F);
      • Threat
        • QAB1(F)
      • Vars
        • Q(c);S_CUTB(b)::QAR2(F)
      • Refutation
        • Q(c);P_PINQ(F)
    • Try
      • P(G);
      • Threat
        • QAB1(F)
      • Vars
        • Q(c);S_CUTB(b)::QAR1(F)
        • Q(c);P_PINQ(F),S_CUTB(a)::QAB(F)
        • B(a);N_GUARD::QAB1(F),XB(a)
      • Refutation
        • B(a);
  • Actual
    • Q(F);
    • Threat
      • QAB(F)
    • Vars
      • Q(c);S_CUTB(b)::QAR2(F)
      • Q(c);P_PINQ(F),S_CUTB(a)::QAB(F)+P(G)
      • B(b);OGATE,P_PINS(I)::QAB(F)
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